Another point, since we are talking about barstools (vs. chairs).
Why do I need to add the barstool ... ummm... I don't know how to call it, the thing what wraps nicely around the stool, and says barstool so that I can turn a stone of any cylinder I want into a barstool, while at the same time I don't need to do that with a simple, off-the-shelf chair?
If I don't add the wrapper to a barstool, it will only give me the sitting position and a BDSM pose. If I add it, though, I have a ton more options. But in the case of a "native" chair, or a "native" bed (or sofa) I don't need to worry about it. Just put the bed there, and you have all the poses.
Why is that?