#1 you can always convert static DAZ Studio models to work in Poser. Plenty of people here have done just that. #2 some vendors make stuff for DAZ and the Poser versions are afterthoughts so the textures, shaders and lighting in the promos aren't great, and some are still running old versions of Poser. There are vendors that do do a great job at Poser content like Santuziy78 you just got to find their stuff.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740