Despite the convenience factor, it isn't great to use a manager tied into your own ecosystem. It should exist outside, with the minor factor of lesser convenience.

I've been so tempted to try out the apple password manager, I'm fully vested in their ecosystem, but the lock in is too big for me to feel comfortable with.

This is the sort of stuff that terrifies me https://hey.paris/posts/appleid/

It also terrifies me. The best solution I can come up is to export out my passwords to a thumb drive every few months.