The high rez square is great for cloth simulations. I think its even called Cloth Plane as its internal name :)

My old Supermorphing sheet was made back in Poser 4, before the cloth room :) (I made the morphs by clothifying the thing in Max and saving out various drapes of that as morphs btw.. so it has been clothified it its far past ;) BUT I agree that it's not high rez enough for a proper Poser simulation. Then again it was never meant to be ;)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.