The main point I'm trying to make here is that even if you're in the "leap of faith" category, you still on some level have to understand the framework constructs (i.e. its API) in order to make use of it. If that API changes with a new version, and you want to upgrade, you're going to have to learn enough about that new API to make the upgrade.

Obviously you benefit from understanding the internals too, but realistically, the more complicated the thing you're using, the less of the internals even a motivated user is going to bother with.