Office chair technology also has really advanced since then (looking at the chair on the picture, which is commonly seen near computers in photos of this era)

Indeed, the Aeron chair, which became a design classic and the apparently the best-selling office chair ever in the US, only came out in 1994. So about the same time as the web. Not sure if it’s the only office chair design with a dedicated wikipedia page? https://en.wikipedia.org/wiki/Aeron_chair