Agreed, this looks awesome but that's a non-starter for me. I'll admit that I hate using OAuth for logins in general and prefer to keep all my accounts separate. However, I'd easily settle for Github/Gitlab for authentication, since I get that managing authentication can be a pain.

This is a fair point, although I have many Google Accounts verified with my single personal number and that doesn't seem to be a problem for them.

I don't like handling passwords and it complicates the signup/login process which is why I don't usually implement password auth for small projects, but in this case I should probably consider it.