I just want it to be able to be easy and short explanation what set of rules we are useing at a given table.
I think that you may end up dissapointed with regard to this, and sortof by design. Actually sort of by the design goals of the game since the core 3 were the only books. 5e was never meant to be a homogeneous play experience, nor one in which you have "5e lite" and "5e tactical" and "5e low-magic", like some folks want. It's always been a game wherein every single table will operate under different rules, to one extent or another. It is
meant to be that. D&D
started with that same intention, though it got lost along the way.
I don't cite Gygax on pretty much anything, because the game has moved on, but when we are talking about the basic identity of the game, this is one aspect where I'm quite glad 5e looked back and picked up one of the greatest gems in the bin of half-remembered toys.
D&D is not one game. D&D 5e is not one game.
We KNOW the new PHB (what ever we call it) will at least incorporate these changes that up until now have been call optional.
Wait, we do? How? From what source? Did Crawford or Perkins or someone go on twitter while I was napping today and announce that the optional variants in Tasha's will be in the anniversary PHB, and won't be optional anymore?
Come on. We literally don't "know" that the PHB will even be revised beyond the normal errata revisions in successive printings. We are all basically assuming it will be, but we absolutely inarguably do not know it.
We know that going forward already things are not going to flow from the PHB but from these new design guidelines.
Eh, kinda. We know that new race options aren't likely to be setting specific unless they're part of a setting book. Whether they will make Dark Sun races look like MoTM races vs having flavorfull setting specific features, we won't know until they print a pre-existing setting with setting specific takes on races.
Call it whatever you want, in 2025 there will be D&D books being published wherein one can play with the newest of brand new options from the never before published settings they're working on now, and the options from the 2014 PHB, and (barring errata issues because that PHB has a decent amount of errata) you won't have to convert or adjust any mechanics, math, or system rules, to do it.
I have an answer for that, but you won't buy it and ultimately it doesn't matter. They can do what they want, and I don't need any more stuff from them anymore.
I often enjoy engaging with your thoughts in a thread, and for that reason I really wish you'd consider not harping on it anymore, then. None of us can convince you, you aren't going to convince us, why keep bringing it up in every thread that has anything to do with new books?