I think it's worth noting that those things are adaptations that occurred after open concept took over. It's sort of a situation where the industry went a direction and never thought to reconsider, backpedal, and take another path entirely. Instead, we kept modifying our response to our poor decision to try and improve it.

But in the era of WFH the cubicles and private offices make even less sense: if I spend most of my day isolated in a cubicle, then why can't I spend that time in my office at home?