I stopped using Chrome when they started doing the "logged in to Chrome" thing for all Google services. It seemed likely a creepy step in a vaguely defined, unknown direction. The signal seems stronger now.
Same. The removal of manifest V2 was one of the worst and most user hostile moves in a long time IMHO. Though the impending blocking of side loading and other locking down of Android stands to rival if not exceed it. Really dark times for Google
For me, the purpose of logging in to my Mozilla account in Firefox is to sync saved passwords and tabs between devices. If I was a Chrome user, I would want to log in to Chrome for the same reason.