I have enabled it since day one. I wonder what will happen if I disable that option? Can user use password for login? Or they have to authenticate with google/facebook ?
If you disable local logins, people must log in with a different authentication method set up. Basically what you would expect.
It also disables the invite feature, as it’s not guaranteed that they will use an email that can be tied to a google/twitter/facebook account, so it’s not safe to generate an account for them.