I was reading over my girlfriend's shoulder, and now I can't find the exact page she was looking at. It is possible it was someone else who was also misinformed about the filters.

This page doesn't make it clear that the reading and access lists are filterable separately, but doesn't say they aren't either. Not unclear so much as incomplete, I guess.

That casts a different light on the whole thing. Thanks for taking the time to set me straight.