These updates seem manageable to me.
My point is this. Will 1D&D be backwards compatible with 5E, probably, But
The 2014 races were mechanically uneven. One race was slightly less powerful than the next. But once you go from one extreme like Half Elf to the other extreme like Halfling, the difference between them is noticeably about a half-feat.
The 2024 species are about the same math, but more consistent. Because the ability boosts are now a separate part of the Character Creation process, the traits that some weaker species get are a solid upgrade, like for Dragonborn. The boost helps flavor. Survey responses tend to be happy with new and improved Dragonborn.
The math will be roughly the same. Standardizing when the subclasses happens is better for the game, but will require paying attention when mixing old and new.
feats ... If I understand correctly as of the last playtest aren't feats no longer considered optional?
D&D traditions are happy to accommodate many, many feats. (Albeit it is wise to make sure any new feats are truly beneficial, and avoid bloat with trap options.)
The first level feat is happening now, in settings like Thera, Strixhaven, and Richtens. The variant Human has been doing a level 1 feat since day one in 2014.
The default extra feat is a few more skills. There is no need to look for other feats unless one wants to.
Heh, here. I am hoping for a drastic vetting of all of the official spells, including many rewrites, level changes, and sometimes rethinking, for the sake of clarity, choosability, and balance appropriate to the level.
But spells are spells. Spells can come from different books. Like magic items, a DM can add new spells from anywhere.
weapon properties etc changing, will it be practical to do so probably not.
Weapon properties are like adding new weapons to choose from. It is simple to pick the ones that one likes.
Net looks like it will now be "Equipment" rather than "Weapon". This kind of tweaking is easy to accommodate and even ignore.
Fighter players seem happy with the new weapon properties, to make the choices feel more distinctive.
Of course, this is all just my opinion, and I could be glaringly wrong.
Personally, I am expecting 5.5, but I also expect updates to be intuitive and painless.
For example, the updates to Rules Glossary are helpful.