Ff has that feature too. It's if anything more secure than remembering passwords because at least you still need the expiration date and cvc (unless edge saves that too).

It depends on what circles you're in I suppose. But I suspect you're right for most people that dislike it. For some of us it's the Chromium engine it runs on, and/or the company it comes from.

Edit: So more ideological reasons. I imagine the browser itself works fine.