How do you expect to choose which account to get in if there isn't a list to choose from?
Currently in Lastpass If you have one account it's auto filled making it a single click.
I would assume it only works if you have a single account. That's the most common situation, though.
LastPass has the option to autofill and auto-submit. 1Password doesn't, but that's my guess for what's coming.
So a 1- or 0-click login once you hit the login form, as opposed to the current 3-click system (see login list, click to fill, click to submit). And looks like it also might handle the 2fa portion (which essentially makes it 1fa).