Yeah, I think its appropriate for e.g. government or job related stuff. Smart to use a burner for other stuff. Thee are also email alias services that allow you to make up new addresses that forward to your main account.

For those who value privacy, it’s bad opsec. First, your personal info such as real name should not be provided to every website you sign up for etc. Secondly, when info like that gets compromised you can’t (easily) change your name, but it’s easy to abandon some non-personal email. Same with biometric data - if your password is your fingerprint and an attacker is able to replicate it, you’re screwed forever, instead of being able to just change to a new password.

They have multiple incomes