[colloydi]

I think this speaks to an important factor which is that most of us have little awareness of our posture and typical sofa designs reflect this. We want sofas to 'collapse' on rather than to sit comfortably. I became aware of this from learning the Alexander Technique to deal with another issue.

One hack you can perform on most sofas is to add some height to the rear legs using castors or wooden blocks or something. This tilts it forward a bit. Sitting back or reclining is fine in a dentist's chair because there's head support but it's no good on a sofa! There our head and spines need to be balanced.

Anyhow -- quality of materials and design are both important but the fact is that average bodily awareness is poor and this is a fundamental reason why our furniture is worse than it needs to be!