While Apple's sign on sounds good on the surface, the reality is more user confusion.
For each app, you have a new button to consider / remember which one you used:
* Login with email
* Login with Google
* Login with Facebook
* Login with Apple
For each app, you have a new button to consider / remember which one you used:
* Login with email
* Login with Google
* Login with Facebook
* Login with Apple
There's a "keep me signed in" feature too. Or if this is a serious source of confusion, use local device storage to keep track.
In practice I don't consider anything for each app. If it's worked I used gsuite. If it's personal I used Apple. OAuth is the new "same password used everywhere" but now we click logos.