It sucks in the way you understand and know because nothing else even exists. No one is interested in having to cater to their walled garden unless there’s money to be made. Meanwhile both Linux and Windows have many open source projects and hobbyists working on things. So you might get a mac driver for something you buy but most of the time macos is an afterthought at best in many hobby projects. Also lol mac gaming is a joke. Even Linux is getting better support now than macos in that regard since the Steamdeck.
Originally but afaik they rewrote basically the whole OS over the years and nothing of the original BSD remains. That’s what I heard but I never verified.