Personal opinion follows and in no way reflects the opinions of my employers:

I think many users are scared of the cloth and hair rooms. They simply don't know what to do in there. Also, and please don't take offense, the majority of Poser users can't be bothered to actually work a scene. At least, that's what it seems like. Most just want to be able to hit a button and make something happen. The cloth and hair room don't really lend themselves to that mentality. You can get something quickly that way in there, using default settings, but it won't look as good as conforming hair or as good as if you put some time in getting the settings right.

I feel the two rooms need to be simplified to make things more user friendly. Once that's done, more "average" users will start using it I think. As of now, it's like the material room was when it was introduced - people wait for someone else to make things they can use with it and then they wait for other people to tell them how to use those things.

At least, that's my opinion based on comments I've seen here over the years and is, to me, why more dynamic products aren't made.