It really seems like they are doing a lot to appease the tiny minority of us power users, adb load unaffected, one time toggle in settings to opt out, no change to alternative app stores as long as the apk was built by a verified developer. Crazy how harsh the sentiment is here, there are real people being harmed by scam apps intercepting sms one time codes and this will reduce the rate of that happening. It's not like we can't sideload anymore, though a lot of comments here seem to be implying otherwise.
Don't love it but (1) it's addressing a serious problem and I'm not sure what the alternative is and (2) if you all remember the starting place, it was staggeringly, dramatically worse, practically a death sentence for F-Droid and seemingly testing the waters for if they could simply power through and do it despite objection.
This is a major course correction that doesn't kill F-Droid. A one time 24 hour hoop to jump through and then never again is monumentally better than losing F-Droid forever.