AaronOfBarbaria
Adventurer
Except I can use them to perfectly emulate the 3E playing style, so that you can't is because of something different about you from me, rather than something different from the 5th edition book and the 3E book - you'll have to excuse me for assuming myself as not being some kind of super-special DM of awesomeness capable of things you couldn't even dream in my estimation that because I can do it, you can do it too.I shoot your "suggestion" down not only because the 5E magic item rarity rules are doing a piss-poor job of emulating the 3E playing style (that is me telling you how bad they work for my purposes)
It isn't the lack of difficulty that causes me to suggest you do it yourself, it's something else entirely that you don't seem to have picked up on from my prior posts...but because you somehow think it is okay to dismiss my wants by "just do it yourself, how hard can it be".
I don't need to make that choice, and here is why: The work, if done by someone other that you, will be "flawed" because that person cannot actually be relied upon to make the same assumptions and value judgements for how important/useful something will be for your game specificially, no matter how skilled of a professional designer they might be.You need to choose. Either the work is so hard that any attempt will be "flawed", and then it is very uncharitable for you to suggest I do it myself. Or the work is so easy I can "take charge of my game" - and if so, why can't I hope for a professional designer to take my money and make an even better job?
Only you can mold a system that perfectly matches assumptions and judgements of value to your own group and campaigns, so only if you do the work yourself is an un-flawed system for your desires actually a possibility.
This should be clearly evident given your opinion of item rarity as presented, and how my opinion of item rarity as presented is entirely different (i.e. it does everything that I want/need it to, and you keep saying that it basically sucks).
Not everyone wants the same thing the same way, so even if some pro designer did put together the type of parts list item creation rules that you are asking for, there is absolutely no guarantee that it would actually be satisfactory to you.And more importantly, make an official job, available to all equally.
So, to reiterate: I'm not saying you should do it because I don't think you deserve official support for your playstyle; I'm saying you should do it because that's the only way to have a reasonable chance of the result being the one you actually want.