How many services do you have subscribed to? from simple PHPBB boards to very much official product and online shops? How do you manage all those username/password? The single point of failure of relying on Google/Apple is real, but so is the manual and laborious process to auth via email/password and the managment that goes with it.

I have 400 entries in my password manager. I manage them with my password manager. There is no single point of failure.