Like any activity of imagination and creativity, it depends on the context around it.
Ummm.. I would say "no." Imagination and creativity know no constraints...regardless of what's around them. Particularly context. That's kinda part and parcel of what makes it "imagination" and "creativity."
There's nothing saying that kobold stat block MUST be part of the default kobold set-up,
No, of course not. But, as you're proposing, for ease of use...for immediate gratification out of the Monster Manual, this is what you would use.
The PHB gives the "rules"/guidelines for Players. The DMG gives the "rules"/guidelines for DMs. The Monster Manual gives the "rules"/guidelines for monsters the DM can use. Can you change any or all of them, of course. Always could. Some people like or have the time to, some don't.
just like there's nothing saying that an onion MUST be part of your meatloaf. You can do a lot of things with an onion. You can do a lot of things with that statblock. The recipe book shows you one way to use it.
While my cooking experience humbly disagrees with your supposition about onions in meatloaf,

that's not really the point. [I make a damn fine meatloaf, if I do say so...]
This is kinda proving my point as much as, if not more than, defending yours. Give me the onion. What I do with it is up to me...Will it work in my recipe? Maybe. Maybe not. I taste. I learn. I move on with more onion...or less, or none at all, next time.
I'd imagine something like the Compendium would even catalog all the stat blocks in one place, so you could use it like a grocery store: go and browse and get what you want to bring home and turn into stuff.
Which is precisely what the MM is supposed to be...why are we at odds, again?
If one wants fantasy adventure goodness in May of 2013, they'll be up to their eyeballs in swords and sorcery in every form of media imaginable and then some, each one capable of delivering an amazing, delightful experience within minutes.
D&D offers something subtly different, but the more hurdles there are to get to that, the more likely someone's just gonna boot up Diablo III to kill things and take their stuff (maybe with friends!) instead of figuring out this arcana, because it's good enough for them.
Then they are welcome to do so. I would PREFER if people looking to play Diablo, go play Diablo! Instead of saying, well people are playing Diablo, we have to make D&D like that. That's not a "solution"...or "innovation"...or whatever. That's pandering and warping things that don't need to be..."changing for the sake of change" is not innovation.
So one way that I think D&D can lower the hurdles is by giving people MM's that are more useful at the table, instantly.
And, I suppose the question here becomes...Why should D&D "lower [its] hurdles"??? This is the game. Learn it. Love it...or don't. The 5e police won't be coming after you to MAKE you love it. Go play something else [or house-rule it] if you don't like it. Noone's stoppign you. But, as I've said umpteen other times in a multitude of other threads, change something enough and it ceases to be the thing it was. that is not innovation or evolution...that's just "change" for the sake of change or "looking cool" or some other reason I can't rightly fathom.
It's also the case that things like the Compendium didn't exist in 1975, and an internet database is by far a better format for gobs of stat blocks than a book.
I don't believe anywhere was I sayign the internet shouldn't be used or a factor. In fact, I would expect to see a VIBRANT monster builder online by WotC. But...again, that's not something that should be
needed to play the table-top-pen-n'-paper RPG called D&D game.
It seems then that we're mostly quibbling over the names of things. And I suppose this is where a lot of the controversy comes from. There's an expectation that the MM be formatted a certain way, and a gut hostility toward changing that format. It's all "Awesome idea, just don't call it The Monster Manual."
That is a big part of it. Yes. You have been saying "make the Mosnter Manual this way"...and, as we find ourselves in a thread about "what the Monster Manual should be"...I must, respectfully, disagree with your proposal.
I see the MM more as "the third core book for D&D, the one with the DM's cast of characters in it."
No argument with that.
I don't see it as an alphabetical compendium of random beasties, because that's never been the point of an MM to me. The fun part about monster manuals wasn't the alphabetical order or the encyclopedic format, it was that these were characters that I as a DM would get to be. So what I want is more help in playing these characters. Not a bigger cast with less info.
I don't think anyone in this thread has been advocating "less info." Nor any formatting that would detract from everyone's fun in using the potential characters presented in the book.
It's an organizational question (yes, with/and the name included). What you propose is not "more useful", easier/more intuitive to use or, except in a very specific definition of the game, "better" to use/more new player friendly by having a bunch of different monsters all glommed in together under a single entry.
I think the old MM format was fine for 1975 standards. Even for the standards that have existed at the start of every edition until 4e.
Funny. I never thought of the birth of the RPG gaming genre...or 1975, for that matter...having "standards." hahaha.
But just because a horse-and-buggy has been fine and dandy for thousands of years doesn't mean that an automocar isn't a more useful way to tool around the countryside. And if you persist in using a horse and buggy when there's cars out there, you become the Amish -- marginalized, small, and insular.

Are you makin' fun of my beard? What's wrong with my overalls?!
Seriously though, I think you are drawing faaaaar to far a conclusion and assuming waaaay too much with this analogy.
Not that the new thing is automatically better in every way (cars cause pollution, this format would probably mean fewer monster entries), just that it's better for your main use (cars get you places faster, this format gives you more material to use at the table).
I understand, KM. I do. And...for the fourth? Fifth time? I like your idea...as/for a supplemental, "easy to use for beginners", pre-made lairs or mini-adventures sorta book. That is not the Monster Manual...to me and I suspect many others.
And nothing you've said sounds like other than "I like my idea. I think it'll work better. So make it this way."
There's nothing inherently "wrong" with that. We're talking about what we'd like to see. We're talking about "what if"...it's an intriguing proposal and discussion. But nothing you've said (other than the onions in meatloaf bit with which I stringently disagree

) has said anything that convinces me
your "what if/I'd like to see" should be
my "what if/I'd like to see."
Respectfully, agree to disagree?
[and PM me once we know what the actual rules are...I DO think your recipe book "Complete Lairs Compendium" is a GREAT idea for a supplemental work....provided 5e has the OGL, of course.

]
--SD