Comment by marshray

I think it probably has more to do with Mac's lack of adoption by the US Government and large corporations.

Microsoft took accessibility of Windows and apps as a basic requirement. The fact that Windows is the daily driver desktop for the staff of the regulatory agencies that would bring complaints would not have gone unnoticed.

But really, why wouldn't you? You almost get it for free if you use the standard widgets, and smooth keyboard navigation is far faster for experienced users than having to repeatedly move one's hand between keyboard and mouse.