@Limax
I use different password for every website and 2fa when available, but I have more than 60 logins and to use different e-mail for each one is a little bit too much. Idea of different e-mail for each site is to minimize damage when someone gets your login credentials and 2fa when recovering passwords. With disabled alias for login this problem is solved, because hacker doesn't know your e-mail for login into your inbox.