IMO, WDM driver shouldn't be mentioned on Mac or Linux since it does nothing there.
There are a ton of things in the list that also "aren't relevant" on non Windows platforms (such as COM Automation support), but the point is that there is no
equivalent function.
In other words, the Mac or Windows versions can't have COM support obviously, since they have no COM. But the OSX port could have Apple Event support allowing AppleScript and other applications to automate it. But it doesn't. Now that particular thing they won't
ever add, because COM Automation is deprecated even on Windows (MCWS is the "new way" and the Mac and Linux versions support that just fine).
But, same rule applies for "audio driver functionality". No, it obviously can't have a WDM (
Windows
Driver
Model) driver included, but it
could have a similar OSX or Linux driver function. It doesn't.