This is about authentication, not about decrypting the data, as 2FA is irrelevant for that. It's the same with gmail, unless you go for advanced protection where the difference is 1) they enforce u2f 2) the process for resetting credentials, including 2FA, is on purpose very slow.
you miss the point, it is not about being able to decrypt your mails or not , it is about someone with enough infos can use this system to access your account. Protonmail isn't Gmail, you don't use encrypted services as you send basic email via Gmail to your buddies.
I use 2FA knowingly that if i lose my device or codes, I'm done. My other providers don't allow me to reset my 2FA if i lose them.
It is exactly why I use 2FA, so only me can access my account.
If they allow anyone who usurped your identity (via credentials stealing for example) and get access, what is the point of 2FA?
I use 2FA with my mobile because no one else has it.
Protonmail should do the same, offer an advanced protection where the process for resetting credentials, including 2FA, is slow on purpose, but I don't see anything wrong with this so far
It is wrong, you don't see it because you don't see the big picture. They shouldn't even think about it, this is a blatant weakness and i smell some hidden agendas for doing it.