So far, these are 1D&D. At least like 90% of what we have seen.
Yeah, the first playtest packet already pretty much puts the nails in the coffin for me.
I already knew about feats becoming mandatory due to new backgrounds, because they've been shelling them around in all campaign settings books already. I absolutely love feats both as a player and as a DM (I use them regularly to vary monsters) but I also heavily rely on feats being optional for players who want low-complexity PCs, and since I mostly play with casual gamers, beginners and kids, having to force feats on all 1st level characters is a dealbreaker for me.
Now I also know I have to force Inspiration too, because they're proposing a natural 20 grants Inspiration. That's A LOT of Inspiration for PCs especially if you run a roll-heavy game. Between my belief that the game is already bloated with advantage, and again an issue with complexity (not as big as feats for sure, but still one more thing to keep track of), in many of my games I practically do not use Inspiration at all, and in the others I use it as a pretty rare reward (typically when a player makes a tactically inconvenient decision as a sacrifice to save someone else or to better roleplay their PC).
Another huge dealbreaker is the "monsters don't crit" change. I have a strong personal preference for the consistency of a world where basic things work similarly for PCs and everyone else, and this puts a huge dent to it.
Don't tell me that "you can always choose to ignore these rules if you don't like" because I will. But it looks more like I will ignore the whole 5.5, because what would be the point for me to make the switch? I am pretty much running 5e with zero house rules!
And also don't tell me that these are only playtest stuff, we don't know if they'll be in the final book, etc... Some proposals maybe will be cut but most won't. And you can be absolutely sure that the fanbase will say yes to anything that makes their current PCs more powerful for free.