Surely not all seating is forbidden right? Sofas, wooden stumps are ok? Just no chairs.

I'd enjoy sitting on couches. :D

Chairs are for capitalist rats! Sofas are cool, I could live with sofas.

beanbags couches stools, there are plenty of sitting surfaces that are not chairs

A world without chairs, but with tables, would basically be like in Japan, where they sit on the floor and have a low table. Doesn't sound too bad.