More likely it's because the scene they're using is completely unrepresentative of what people are interested in: almost no triangles, primarily procedural nodes (for spheres), and in general a fairly simple scene.

In terms of how its business works, Apple is primarily a fashion company.

A deeply technical one, yes, but that's not what drives their decision making.

I'm certain that web style scaling is what the vast majority of desktop users actually want from fractional desktop scaling.

Thinking that two finger zooming style scaling is the goal is probably the result of misguided design-centric thinking instead of user-centric thinking.

Not to mention that only a small fraction of the world uses inches...

Thank you for that. The excellent fractional scaling and multi-monitor support is why I finally switched back to KDE full time (after first switching away during the KDE 3 to 4 mess).