I read parent's point as having a hierarchy of stuff they want to do, and daydreaming is not worthless, just not as important or rewarding as any other thing th

I read parent's point as having a hierarchy of stuff they want to do, and daydreaming is not worthless, just not as important or rewarding as any other thing they were doing during their commute. For instance for people reading around a hundred books a year, would they want to spend more time daydreaming instead of reading ? Probably no.