I have a personal email that is associated with my real life identity, and everything else is a different alias. If you have the option for unlimited email aliases (f.i. w proton unlimited), make the most out of them. Otherwise if those are limited you could generate few general purpose ones like shopping (Amazon, Walmart, …) Social media (faceobok, instagram, …) etc.
I think there are pros and cons in both situations. Diversifying the services used reduces the dependence / trust on a single company but at the same time makes it less convenient (and potentially more pricy) to run your services. This is one of the reasons proton’s offering is very appealing. Especially if you plan to use most of their services (VPN, email, drive, calendar, notes)