It might be a barrier for open source and freeware authors that create a Mac version out of the goodness of their hearts rather than some expected profit (e.g. Handbrake, Subler, etc.). There's also the matter of Apple not allowing certain types of Apps on their App store, so the ONLY benefit an author who cannot hawk their program on the App Store gets is getting around their gatekeeper (I think the app only has to be by a recognized developer, not actually on the App store).
These sorts of things make the Mac less desirable for both author and user alike for widespread software (i.e. Linux conversions, blu-ray copying/ripping software, etc.) Personally, I don't want to see LESS software available for my computer. The Mac had many years or small support compared to Windows and between 2012 and at least a couple of years ago, I thought the support has been pretty good (very few things I wanted weren't available for the Mac) and that includes many top tier games thanks to the efforts of Aspyr, Valve, etc. But right when Apple brought out Metal, I noticed immediately gaming started to dry up again. Most blamed this on developers having to convert to Metal, but I see very few that really have. The Mac is a desert for games once again and now it seems Apple wants to do the same for application software, caring more about their personal profits than the good of the Mac user and the health of the overall platform in general. They already managed to drive away MANY MANY professionals between the Final Cut Pro fiasco and that STUPID "trash can" Mac Pro.
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Is that something you know personally or is it just made up conjecture to try and win an argument? Unless you work for Apple and work on macOS personally, I don't see how you could possibly have any idea how it's a "PITA" for you personally.