I have 300 people on my floor, the group closest to us is from business and spends 2/4 hours a day on the phone. It saddens me because the largest openly claimed benefit of Open Plan offices is "increase collaboration". What I literally see is people locking themselves with headphones and trying to hide in rooms to get some silence. I mean, people literally have to walk around teams to go to the toilet or get a coffee.
I'd like team size cubicles. That would sound to me like a good compromise between collaboration, and deep work. I'm sure people would open up more. In fact, it is how it was setup at Bell Labs back in the time [1], not the pale copy we see everywhere today.
A bit like Agile has become Scrum I'm guessing :).