I'd never given a lot of thought to it but even the fairly large house I grew up in during the 60s/70s didn't have a dedicated office although there were large bedrooms with desks. I was fortunate enough to have a nice dedicated office before the current situation hit.
One does see a huge contrast on video calls between people in seemingly offices (or, if bedrooms/living rooms, sufficiently stage managed and lit to appear as such) and those obviously balancing laptops in a bedroom or kitchen table.