The most important thing DAZ|studio doesn't have, is a save-as PZ3 function. 
I agree about powerpose and the content-interface, Powerpose is just super, and the content finder is so much easier than the poserlibrary. But there are stil a dozen other things why I still use poser and refuse to use DAZ|studio, no dynamic clothes, no dynamic hair, no rigging (set-up room), no procedural shaders, no native poser export function, no python scripting etc, etc.

I started 11 years ago with Bryce and Poser and they both had the same  interface, once you get used to it, it's not that difficult.

-How can you improve things when you don't make mistakes?