There are plenty of RHEL docs that will show up in a search but are inaccessible because it's hidden behind a login.

That's not documentation that's support knowledgebase. You can just pay for a single subscription at 349$/yr and get access to it. It's worth it if you are running a large fleet.

Upvoting because you are correct that the documentation is freely available and it’s only the knowledge-base that requires an account. However, there can be some very useful information in the knowledge-base, e.g., resolutions to problems that don’t have a readily available answer anywhere else on the Internet. If you’re not running a large fleet, a cheaper option is to sign up for a developer account which costs nothing.