Why all office chairs must become more computer desk friendly

Are the old designs of office chairs viable at all anymore? Pretty much everyone in every office everywhere in the world uses a computer to aid in their business. At this point all individual office seating must be computer chairs. These chairs are ergonomically structured so as to give maximum support and consequently reduce back pain. And anyone who has spent many hours working at their desk in front of a PC knows how uncomfortable it can get. In fact, with many older style chairs, back pain can occur within just minutes of being seated due to undesirable hunching over that these chairs cannot eliminate.