I think ergonomic chairs are good for people who have poor posture. If you have a strong core and sit up straight all the time, you can probably sit on just about anything and be fine.

(I'm not saying you're wrong. I think the real solution is that people should take better care of their physical selves. Certainly there are also people with particular conditions and do need the more ergonomic setup, but I expect that's a small percentage of the total.)

Well, I do lot's of sport and can sit comfortable on hard ground meditating for quite some time. I still enjoy a good chair way more than something "normal" for any longer computer sessions.

If a chair is too comfortable, I just fall asleep in it. It doesn't make me work better.

A chair isn't any answer to poor posture. The answer is exercising your core muscles, being aware of your posture, and constantly correcting it.

Well, I found a good chair helps me, with keeping a good posture. Otherwise good advise.