I have to say that I was quite dismayed by Mike's post.
So presumably cannot he see that "lossless downloadable audio files" != "downloadable lossless audio files". That kind of ambiguity in a large section of my career could have had fatal consequences and I can tell you from first hand experience on several occasions that it isn't funny being accused "your software has killed someone". The accusation was never true.
It was clear to me that you didn’t really grasp Matt’s question and you definitely didn’t understand my answer.
I understood both perfectly well, thank you.
FLAC is not supported by the MacOS
It does not matter. FLAC and any other "not supopoerted by MacOS" formats are primarily the responsibility of the application, not the OS. If it had to be supported by the OS there would not be, for example, a multitude of music players for MacOS that play FLAC files.
In another part of my carreer I was involved with image capture of confocal microscope images, where the software scans a sample multiple times through the Z-plane, deconvolutes each image, recolours the image as it's usually taken in monochrome, and build a 3D image of the sample. I'm pretty sure nnot much of that is supported by the OS either, so obviously would also be infeasible.
Before accusing others of being an "armchair expert", please check your own understanding of things.