That's because that comes directly from the commercial companies rulebook. Apple (for example) will not make an application that runs better on Android or Windows than on one of its OS.
It would not be beside any of the big brand to remove something that was working before just because that remove a tiny bit of interest in their own platform. That makes cruel business sense ... and they are also hated for it when it happens.
Let’s not forget that thanks to its libre licensing this is a strategic issue, but not a technical one – recovering the removed features on macOS is a few patches away.
There's a place for ideological purists in software and I for one am glad RMS is around.