Interesting! Elaborate it:
Is it because they are storing customers emails on a data base that could be potentially exploited it?
Or because knowing the email of a customer makes the impersonator work easier?
Discussion
Yes.
I definitely like your point of view. I wish I could trust my users, say, with a pair of keys and a non recover account.
I guess password managers and pseudo-mail accounts (“hide-my-mail kind of”) are still in the game. Though the password manager would help with the pair of keys too