Also might matter that open floor plans make interacting with people convenient, and it's a large part of their job to interact with people. I really only need interaction with people for well under 10% of a normal work day.
What makes perfect sense for their kind of works does not make as much sense for my kind of work.
For me it makes interacting with people even more inconvenient. Now instead of having a conversation with one person, I'm effectively having one with a dozen or more. So everyone's booking entire conference rooms just to talk 1:1—even if the topic is fairly benign or banal, nobody likes eavesdroppers.
Why would you even pick up your phone without leaving the room or trying to find some quiet space? I'm trying to keep my private conversetations outside of my work environment, not because I don't want people to hear things, but because it can annoy/distract people around me.
I couldn't always predict when a call would come in over something and the only "quiet" space available is out in my car. It wasn't always a good option but I would go out there if I had to call someplace about a bill.
I was mostly surrounded by customer phone support people so I doubt I was distracting them.
What makes perfect sense for their kind of works does not make as much sense for my kind of work.