What is it with services now separating username and password fields?
Back in the old times, on the sites I log in regularly, my browser filled in both username and password. I clicked "Log in" once, and I was set to go.
But no more. Now it's all first a username, then a password. From what I saw, Apple started this many years ago, but now this bother really spread. And it's not like I can just double-click on the same screen area, oh no. Animations make sure that I have to wait several hundred milliseconds before the password field is there, and depending on the site, I even have to select from my browser, which login I want to use, twice!
Why, oh why?
All my screens are really big enough to display 2 text fields. What are arguments for this behavior? I don't see any.
That could be done after the user enters both the email/username and password
Edit: sorry, I think I misunderstood what you said, but if someone is using something like "sign in with google", we've had separate buttons for that for ages.
I think it might solve the problem that people often don't remember if they created their account using SSO or with an email/password combo. So the site looks up your email to see what login method you use in order to redirect you to the proper prompt.
Yes, with a limited set of federations you can have the user make that choice beforehand. But sometimes the options are changing all the time and/or you don't want to announce all the services you're federating with, or it wouldn't make sense anyway.