Are you sure?
Scenario 1: I’m at TL2, an anonymous user is being created, it inherits TL2. I go to TL3 but can’t go and post anonymously in my favorite category. I get a weird error.
Scenario 2: I’m at TL3, an anonymous user is being created, it inherits TL3. One year later I’m back to TL2. There is a category which allows me to post anonymously but does not allow me to read topics as myself.