You define "fair" as "whatever the market for a particular sort of job will support," but then throw in a comparison to other, very different lines of work and note some differences. What's the connection?
The comparisons are to show how other professions have a common level of benefit. On the overall market, RTO is not exceptional and it is understandable why employers for a particular field would be hesitant to grant WFH as an added benefit on top of already provided ones. As it turns out, even for the software field, this is not something easily granted.