The trouble is, most "audio pro's" don't really have the technical chops to understand why this is the case with MacOS, nor why Linux represents a parallel advance in audio processing technology. You can do things with Linux audio that are impossible with MacOS, due to its general-purpose nature - but MacOS still provides great value to the consumer, not just professionals.
The great thing about Linux audio is that the devs pushing it forward don't have any of the constraints that the MacOS/iOS folks have to work under. This gets mis-underestimated by audio pro's, imho.
But with things like kxStudio and UbuntuStudio and Zynthian out there, this is going to change radically. I think the audio world is in for some very big upheavals in terms of Linux adoption over the next few years .. but I have all of these systems operational in my pro studio, and have poked these beasts multiple times. Linux rules for audio, and hardly anyone knows .. thats another kind of elite realm left to be explored by the curious and adventurous.