I would just say that people aren't used to it. Also you need to decide how you want to send the email. Once on signup (long-lived token, not recommended), onc

I would just say that people aren't used to it. Also you need to decide how you want to send the email. Once on signup (long-lived token, not recommended), once a day (weird, annoying), or on demand (user gets email instead of entering password). I think it's interesting but in practice passwords are more secure and people are used to them.