It’s good for some stuff - it means you get strong unique passwords for sites etc.

BUT

The fact it auto completes basically means that if someone gets access to your phone/computer while it’s logged in, they can log into anything. (A password is normally required to actually VIEW them? - maybe not on desktop!)

I use the built in manager for most days to day stuff, but anything financial or non browser based is stored in keepass. It’s a bit annoying, but way more secure that way.