Why are desks and chairs designed so poorly?

Don’t get me wrong. They’re typically comfortable enough in all of the obvious ways, but I have yet to find a desk & chair combo that doesn’t force you to look downward at your screen.

Maybe I just have a long torso. I’m fairly average in height.  (172cm ~ 5’7″)

I’d like to be able to lower the average chair by about 6″ or raise my monitors. I think I’ll start putting my monitors on something so I can sit up straight while I work.

Alternately, I could purchase an ergonomic solution.