Not sure if this is an issue on desktop.
On the mobile client if I want to autofill say a Google account on a google app (or alternate google website) that has not yet been registered to that account profile nothing will show up.
This is expected since its a different URL, but I cant autofill with any account profile now.
What I am suggesting is an option that once I press autofill on my login, I can select any of my account profiles to login, that way I dont have to exit the app any copy and paste my username and password manually.
It would just kind of speed up loging in on an app.