Signing up via email on each site means a password manager entry at a minimum, and probably no 2FA, or brute force resistance.
You're basically at the mercy of getting hold of google's nearly nonexistant support to get this resolved
I have a one-click button to download all my data from Google (which turns out to be an absolute pain because it's in the ~100s of GB range).
FB SSO isn’t really an option for an early stage consumer product, but if it were I can see Potential benefits to the products that are succeeding avoiding sharing real-time success metrics with FB.
Presumably, Apple is also influenced by data like this via the App Store.
For example Apple probably pays attention to Autosleep and other sleeping apps in deciding to build it into WatchOS.
does it tho? I know that is the sales pitch but is that really the case in 2020 with facebook's login?
"Login with Facebook" isn't popular because it saves developer time. It's popular because it massively reduces signup friction which results in higher conversion rates. These things are super important. We offer Google login with our only consumer facing app[1] and we see a solid 40% of accounts use that method vs. email. I would venture a guess that a sizable minority, bordering on majority, of those accounts would simply never sign up in the first place without some sort of SSO.
I agree with your sentiments and frustrations, but whenever something seems to be too ridiculous to be true (as this might seem to some devs) there's often something else at play.
[1] Squawk - Walkie Talkie for Teams https://www.squawk.to