As for the Mac it seems we've come a full circle: Mac OS -> OS X -> macOS
However, if iOS apps do come to the next version of MacOS, we might be on the verge of delineating Mac OS X and MacOS into truly-separate generations.
On the Mac culture, UNIX is only an implementation detail, most users don't care one second it is there.
Not even Mac developers, those that actually target Mac users, not using it as a workaround to avoid dealing with Linux/BSD issues on laptops.