No, it's that Zbrush has a very difficult learning curve, and going from "Poser "( A) to Zbrush and back again is a lot of guessing game work.

Hexagon promised easier displacement painting but it also has issues.

Also, displacement is great for soem things, but not so great for others, especially when you are combining it with morphs on a animatable figure, and you cannot see what's going on in preview.

In addition, adding a bunch of hi res displacement textures really eats up even more valuable resources.

There are a few great products over at Daz that use displacement (Stonemason released his first over a year ago now), but for figures and posing there are some compromises one needs to address.

Best combo for poser is actually morphs along with displacement mapping.

Way too many people take way too many things way too seriously.