Don’t lock yourself in apple ecosystem especially in such important thing as password management.
Second, what would happen if you were locked out of apple id account? Or don’t have access to apple hardware.
Password manager should really be platform and device agnostic.
That’s why people used stuff like 1password in the first place.
You really don’t want to put all your life into a single account (that’s why you should not use sign with google or what have you).
The delta has greatly decreased.