White collar work in the modern era is also very unrestricted. I can slack off during most of the day if I want (and nothing urgent comes up) and my manager will neither check nor care. Because of 24/7 systems, I can completely bunk fridays while pretending to work from home and just staying online from the phone. It is totally irrelevant to my job. I hate fridays and usually work Sunday to Thursday in reality. Many people I know have this level of flexibility in many fields.

My “work hours” in my pay slip say 75.8 for every 2 weeks. I work maybe 50 hours in a busy week. It is irrelevant to my organization. So we are already there in terms of intellectual white collar work.