Please read my post here:
Definitely submit feedback but also make your opinion heard in the official forum post that the YouTube Community Manager made upon release. There is already a lot of comments and the CM has already responded.
Sounds like Brand Accounts could be coming soon..
As for the other issues, not sure.
Funny how everyone else got pushed the update recently so now they're all complaining.. the rest of us who side-loaded it have been pissed for weeks now.
As someone who also hates this new update and will cease using android TV if it isn't reverted, I found the official feedback link specifically for Android TV. Please use it to let them know how you feel