Strongly agree. A guide for dead simple setups would be incredibly useful (e.g. gsuite as idp, oauth for a single app).

It took me a few days to get that basic setup working, and a few days more to improve it. But once it was up, it was rock solid.

Keycloak might seem a little daunting to start with, but is basically glue between your idp (ldap) and whatever apps need to authenticate.