Fresh out of undergrad, open office layouts feel familiar to the long hours spent sitting at big tables in library basements, so I can see why some people like it initially. After a few years, you will be pining for four walls and a door to get anything done.
> The difference is, with your own space you can do deep work on your own terms. No longer is your train of thought constantly interrupted
What's wrong with headphones for deep work? Or appreciate not everyone has these, but where I work atm we have small 'quiet zone' booths where you can take your laptop if you really want to focus deeply.
As for being interrupted, again maybe it's just a company culture thing. Where I work people are generally pretty respectful if they see you with headphones on intensely focused on something, they'll probably just ping you a message on slack asking when's good to talk. But equally if people have headphones off, open body language- everyone feels happy to strike up conversation and there are no barriers in the way of collaboration.