At which point the question becomes not "why don't we just use the stats?" but "why are we buying these books, again?"
I don't know. Why are you?
This is what kills me. So many people post things like "The description of Monster X was SO GREAT in the 2nd edition Monster Manual! Why doesn't WotC just use that?" Well... one, your opinion on that monster doesn't match everybody else's, so the 2E description is just as useless as any other editions... and two, if you are using the 2E description then it doesn't matter what is in the 5E description! So to make the 5E book actually worth buying... let's see some new ideas (or further adaptation of established ideas) so that it's actually worth buying the book.
Why would anyone buy a book that was a cut 'n paste job from every other book? Cause all the pages someone wanted were all bound together all nice and pretty? Same exact information they already own... but now all put in one place. Great. That's money well spent. Couldn't be bothered to just photocopy the various descriptions from all the different books themselves... everyone needs WotC to do it for them.
Taking a simplified example from the terrible Pathfinder characterization of goblins: my goblins, by contrast, are actually pretty smart. When I run in Pathfinder I have to use a completely custom stat block for goblins because their goblins are the poster children for severe brain damage. This is frustrating. It could potentially be /so much worse/ in D&D5 if they follow the D&D4 monster design strategy while caricaturing all of their monsters.
Basically what you're saying here is that YOUR IDEA of a goblin should trump everyone else's. It should be written in the book exactly how YOU want it... and to heck with everyone else. And why? Because you don't want to have to create custom stat blocks.
Despite the fact that even if Pathfinder *didn't* make their goblins "brain-damaged"... you probably would STILL create a custom statblock for them because whatever they put down would STILL not be exactly how you see the goblins in your head. Thereby rendering the entirety of their efforts for naught.
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