I worked for a freight company where many of the data entry jobs were performed in air conditioned comfort while the physical work involved heavy lifting in the Phoenix heat.
The data entry jobs could be learned in a day.
The physical jobs involved operating heavy machinery which took weeks or months to master. Many of the jobs required high degrees of physical strength, CDLs, hazmat endorsements, physical exams every two years, FBI background checks, random drug tests, and involved constant danger and legal liability.
Truck drivers and dock workers meeting those requirements are difficult to come by, while data entry employees are a dime-a-dozen.
Which group do you think was paid more?
Well, in your example did the truckers make frequent raids on the pool of data entry workers to do the grunt work outside while requiring that the data entry people simultaneously to keep up with their own workload indoors (since that workload theoretically doesn’t exist)? When data entry workers called out or fled to other employers and there were only finite man hours available for the work at hand, was the data entry work suspended in favor of keeping the truckers trucking, or did the truckers have to suspend their own work to cover the data entry shifts because without the pink collar workers no money comes in, no customers are waited on, and the place would quickly stop meeting its payroll?
In another words, apples to oranges. Mission critical work should be respected.
You can train someone to play chess in a day, but that doesn’t mean they will play it well.