In general, bosses want white collar workers to work 24/7 — at home, on the train, in the car, etc. etc. It’s ridiculous. Push to keep your work and home life separate. And if your boss expects you to work on your commute, count those hours towards your “40 a week”.
I actually wouldn't mind counting the commute towards my workday if we had reliable public transit with secure wifi around here. I could get set up, go through emails, square my head for the workday, etc. on the way in and wind down, answer emails, finish up small tasks on the way back. All while actually committing 8 hours a day to my employer rather than 8 plus commute time. Could allow more flexibility for folks living further away from their office as well.
I feel like the argument against is always going to be the same though. Work outside the office isn't Real Work because Real Work can only happen in a cubicle under surveillance. It's the same reason they don't want us to work from home
When I remote in on the bus to/from work, that's work hours. It's slightly cheating on the maximum 40% WFH but I haven't had complaints. I share network from my phone