I think that this is sort of missing part of the comparison in that it's meant to compare similar highly demanding jobs which require a specialized education. While labor is incredibly important and I respect the hard work, it's a different skillset entirely that doesn't have the same prequisetes. I would suggest the comparison is between professions with the same demanding hours and same demanding prequisetes, not just the hours. It's not to diminish other jobs with long hours, it's just they're not the focus of the comparison.
(To further elaborate, my very first job was picking flat stone at a quarry, since it was popular for home gardens at the time and machines couldn't get the stones easily without breaking them. Long hours of hard work in the dirt and mud plus many split knuckles and crushed fingers. Still, I was able to do it as a 15 year old unsupervised and with no training. It was useful and hard work, but not really the same as the IT I do now, the majority of which is watching progress bars.)
(To further elaborate, my very first job was picking flat stone at a quarry, since it was popular for home gardens at the time and machines couldn't get the stones easily without breaking them. Long hours of hard work in the dirt and mud plus many split knuckles and crushed fingers. Still, I was able to do it as a 15 year old unsupervised and with no training. It was useful and hard work, but not really the same as the IT I do now, the majority of which is watching progress bars.)