The real annoyance is that we need a "password manager" in the first place
You wouldn't need to worry (too much - as long it's not a weak password) about password reuse if websites abided by security best-practices and wouldn't leak lists of weakly hashed password. salt + pepper + good amount of rounds proper hashing function: good luck
And to be fair the browser ones work great. Another one that works great is a paper notebook
And again, it all depends on your threat models. Using very complicated passwords and 2FAing your password manager will only ensure that you'll get locked out of your accounts sooner or later (unless you have a target painted on your back for some reason)