[fivre]

OIDC seems like it can reasonably help in a fair number of these cases, maybe? it's iffy because (a) the major providers, are, well, Google and their ilk, (b) SSO solutions trend toward reducing user confusion at the cost of choice--im still out on whether the common "enter your email/account identifier so we can select which IDP we use" login flow is something of an anti-pattern or not

i generally like having the option for "sign in with github" as opposed to the all-encompassing "sign in with google" (ignoring that github is a microsoft account but not quite at this point)

smaller-scope IDPs for a particular field ("ey, you work on code stuff? you probably have either a github or gitlab account to log into our code-adjacent service" or "ey, you use stackoverflow? you can use that same login on superuser") is maybe a decent middle ground, where shared authentication is more explicit than third-party cookies were