The way I view it is that personal time means time id spend if work didn’t exist. If work didn’t exist, I wouldn’t commute. So, to me, it’s work time.
Yes it’s “easier” (sometimes) than working, but it’s still time I dedicate to work. Its entire purpose exists because work exists.
I used to have a really gnarly commute (1.5 hours one way, so 3 hours total, 3.5-4 if there was an accident). The level to which it affected my finances is one thing, but it absolutely demolished my quality of life. I couldn’t socialize, sleep, or even cook for myself due to the exhaustion. And spending minimum of 12 hours a day sitting destroyed my body and mental health. Not to mention traffic is not peaceful, it’s stressful. You have to constantly be “on” and paying attention. Even a single second of distraction can be an accident.
I generally agree that commute should count as work time more often than not but its complicated when you can take advantage of the commute to get other things done near your work site or along the route. E.g. if you commonly stop to get groceries half way from work to your home then perhaps you would have needed to spend time for that trip anyway. But that's more of an excuse for a 30 minute or less commute, not for over an hour.