I study on the bus because it's the perfect environment for it to me. I'm on the bus, so I can't do anything else. I'm on the bus so there isn't any expectation that I'm working nor can I change when I get to get to work. My mind is just at ease that there is this naturally occurring block of time with the perfect conditions to help me accomplish an important goal of the day without impinging on any other part of my day and that is solidly baked into the routine in a very stable way that doesn't require me to exercise any executive function to ensure it happens.

My bus ride is very valuable to me for this reason.

Try as I might, on the WFH days I virtually always wind up doing this same block of study after 10pm which is my free time.

I also get interrupted just as much regardless of whether I'm at home or in the office, so that's kind of a moot point in my particular case.