there are still other ways (like Xamarin) where the actual building could be done on an old mac mini or similar.

This is not particularly interesting. You can't leave the Mac ecosystem because of vendor lock-in. To me this would make me want to change my tech stack. If you don't care, you are just not the target audience for the article.

You're just as uninsteresting as people not switching to Mac from Windows in 2010 because it doesn't play games.

The problem is that you legally can't drop MacOS unless you want to drop iOS which is pretty difficult to do when it is the second most popular platform right now.

I don't recall if the restriction is compiling on Apple hardware or under macOS but while people had iOS compilers running for a while I think they have fallen out of date.

Do you have to compile locally though? Or could you use a cloud based system for compilation?