If you go to most Fortune 500 companies they will have a whole team of people dedicated to running an IdP and doing integrations. Most people on these teams cannot explain oauth, oidc, or saml even though they work with it every single day. It’s that bad.

that is because oauth, oidc, and saml fall under the category "webshit" that doesn't matter, there are also thousands of C++ programmers who cannot explain the latest reactular .js and other bullshit the script kiddies continue to pump from their collective anus