WotC is, by causing the confusion I was talking about.
What I've been told by people by two people on this very thread is that everything will be active. I can pick an choose the rules I want where they vary, and we can have conflicting RAW. That the 2014 feats, without requisites will be just as valid as a 2024 feat with the same name. That I can pick the 2014 or 2024 version of a spell or race or subclass. It's like right now there's a version of races that's live in a number of books and the same races live in MP:MM which didn't (for the first time) errata the previous so both are valid choices.
That's a heck of a lot different than consider 2024 versions as updates/errata where if something has been reprinted the new version takes precedence, but anything untouched would still be live, which would also be a continuation. This is basically 5e up to this point, and when there have been updates like Tritons getting darkvision they errata'd it in a bunch of books.
Vs. it being a clean edition cut and you can't use things they haven't come out with 2024+ versions of, so you can't take Elven Accuracy as a 1st level feat with your background because it has no level requirements.
These are vastly different games, and it needs to be clarified which we are getting.