I'm old enough to remember having an individual office (and, a bit later, two-person offices). Great for collaboration, because it had a whiteboard and enough space/furniture for a few people to huddle, and for focused individual work, and for meetings with remote people without disrupting anyone and without taking up a meeting room. Nowadays we have unforced poor conditions and outcomes, mostly for pretend savings on facilities.

And, of course, serendipitous collaboration rarely happens when everyone is sitting with noise cancelling headphones, focusing on hitting their ambitious individual goals for the quarter/half/year.