I'd like to hear about the experience if you're willing to share it.

The experience wasn't about the domain of rationality but another subject and the relationships of concepts in that framework. If don't think it's useful for people without the experience of the framework.

How basic are we talking about?

As basic as you can get. What is the most basic thing you can say about rationality. If your reaction is: "Duh, I don't know nothing comes to mind", that's exactly why it might be worthwhile to investigate the issue.

Recently there was a discussion about vocabulary for rationality and someone made the point that things can be said either implicit or explicit. Implicitness and explicitness are pretty basic concepts.