I don't like those "login with Google / Facebook / etc", nor that "Type your email -- receive the code -- fill in the code". OpenID would be better I think. You

I don't like those "login with Google / Facebook / etc", nor that "Type your email -- receive the code -- fill in the code". OpenID would be better I think. You can design it to use something other than a password for authentication if you want to; it mean the authentication system can be independent from whatever you log in to.