At a previous work, I implemented a SAML login flow and once I found out how easy the back end is, it really made me wish that more websites would allow you to enter your own SAML provider instead of locking you into the big ones.
If you could, I'd likely run my own, but it also would mean that your password manager company could instead be your SSO provider because that's really what a password manager is. They use a normal local auth/master password unlock and approve it.
But I can say that none of the big corps want that because it'll add competition. They'd rather have a limited set of big corps that they can colude with to keep competition limited than service their users.
> https://flyovercountry.social/users/encthenet/statuses/117010461171912976