You think every one of these supplements will be updated or errated to be compatible with the new version? I don't:
Sword Coast Adventurer's Guide, Xanathar's Guide to Everything, Tasha's Cauldron of everything, Guikdmaster's Guide to Ravnica, Eberron Rising from the Last War, Explorer's Guide to Wildemount, Wayfinder's Guide to Eberron, Mythic Odysseys of Theros, Strixhaven, Spelljammer, etc..
You identified four "problems"
1) Humans can't get feats to start with an 18. Not a rules issue that needs updating, this is the change for 1st level feats.
2) Critical hits. Explicitly part of the playtest they may not keep. They've said that. I think pointing out these issues is important for showing why this rule may need to not be kept in the final version
3) Grapple issue. This is a fundamental change, but one that is pretty easy to fix. I literally just did this for plasmoids earlier today. They have advantage on rolls to escape and grant disadvantage against people they are grappling. Fairly easy fix.
4) Changes to short rests. This has been something changing over the last few books, so it isn't even an OD&D problem, as much as it is a pre- and post-Tasha's problem.
So, with these as our examples....
Sword Coast Adventurer's Guide -> Nothing you listed applies. No rules changes needed.
Xanathar's Guide to Everything -> #2 for one ability of one class, for a rule they may not keep
Tasha's Cauldron of everything -> #2 for one ability of one class, for a rule they may not keep, maybe a handful of #3's
Guikdmaster's Guide to Ravnica -> Nothing not already covered by the above
Eberron Rising from the Last War -> Nothing applies
Explorer's Guide to Wildemount -> Don't think anything applies, haven't read it in a while
Wayfinder's Guide to Eberron -> Nothing that isn't covered by the above
Mythic Odysseys of Theros -> Don't think anything applies, haven't read it in a while
Strixhaven -> Don't think anything applies, haven't read it in a while
Spelljammer -> #3 for a single race
So... most of these books don't even need a rewrite. Most of the actualy things that need changed is grappling. Which can be trivially accomplished by a single line of text in the PHB
"If you have advantage on strength saves and strength ability checks, you have advantage on rolls to escape grapples and grant disadvantage against people to escape your grapples"
And BOOM. Everything except plasmoid is fixed.