Easy: Apple hires TEAMS of designers, UX-experts/engineers [...].
The reward incentives in open source environments are not aligned with the required workload. People who seriously compare any modern linux desktop environment to the UX that macOS delivers must be lost in tunnel-vision/confirmation bias, it's not even close.
Also, like some said, as Apple provides their own hardware, they don't have to deliver general solutions.
I've used OSX for a year after over 20 years of Linux. I really tried to like it, but to me or didn't feel any more polished than modern Linux distros. Just... different. Different flaws, different glitches, different inconsistencies, different trade-offs. shrug
Hardware wise I think if you use modern (i.e not older than 5 years) and also not just released hardware you are mostly ok. I haven’t had any driver problems, but that’s not to dismiss other peoples’ experience.
Android and chrome os (hell, even Darwin if you squint) all demonstrate that taking things away is the path to consumer happiness.
I am a professional user, I don't want a lobotomised system. An airplane cockpit is not like a car dash.