The problem with saying that certain fields require total commitment is that many societal groups get completely left out of those fields entirely and the fields are poorer for it - parents of infants and small children, people who have to take care of elderly family members, people who have to work vs. people who have independent wealth or support while pursuing degrees. Any profession can be part-time - there are part-time lawyers, part-time professors, etc. But the structure of training does not even allow for normal full-time hours, sucking more and more out of those in training right at the height of their adult financial, community and childrearing responsibilities. On the other hand, people need to realize the worth of their own contribution in terms of societal interest and support - it’s easy to get blinded to the fact that maybe we don’t need one more dissertation to make the world go round.