You mischaracterize me as shooting for a particular solution, when what I'm shooting for is the truth of what is coming out.
The video says everything is valid. So I can, for example, pick a 2014 feat even if it's been replaced by a 2024 feat. Any books past the core is additional material, even if redoing material from earlier books.
Another still continuous is that the 2024 are updates - consider them errata. So I can still play a half-elf in organized play, and with my 1st level background feat pick Elven Accuracy since I meet it's requirements. Because those haven't been updated. But if I'm using a spell, rule, class or whatever with two different version I need to use the 2024 version in organized play. Any books past the core are also updates, so characters using material published before 2024 might find themselves having to change when a book is published. This is one of the places the UA is pushing, especially with their non-standard definition of "backward compatible" early in the recent one.
Then there is the "not continuous", where things like the half-elf or subclasses from other books or even a feat from 2014!PHB but not republished in the 2024!PHB aren't legal in organized play. Which we generally call another edition. The UAs could also be interpreted as going for here, much like the 3ed -> 3.5ed change.
I am not pushing for any of them. Well, that's not true - I am pushing for a balanced, playable set of rules, which I'm not sure if the 1st can provide. If there are ever two conflicting sets of RAW and the DM needs to use their authority to downcheck one, then there's de facto multiple editions even if that word is verboten.