I've started to think that we should really WARN whenever a (set of) GUC is set in a manner that the server will fail to start - not just for shared libraries.
In particular, I think the server should also warn if it's going to fail to start like this: 2022-06-15 22:48:34.279 CDT postmaster[20782] FATAL: WAL streaming (max_wal_senders > 0) requires wal_level "replica" or "logical" -- Justin
