Higher resolution geometry isn't going to fix the problem with figure joints. the limitation for the most part is the rigging system itself, but a lot of that can be overcome with joint controlled morphs, or added ghost bones to some extent. the reason that you don't see super accurate joints even with those options tends to be that if you get too complex it can get to the point that the figure becomes near impossible to support with conforming clothing, which despite the advent of Dynamic clothing is still the most popular solution for poser users.