The really big thing that gets me on macos is not having focus-follows-mouse and works-everywhere select-to-copy middle-click-to-paste. Yes, this is "just" a UI thing, and yes, I can more or less get used to the macos choices (I used a macbook air as my "take to conferences" laptop for some years and still use it as my "video-calls machine" -- when I bought it no PC was close for hardware quality and weight at the price). But I've been using a Linux window manager with those behaviours for 25 years now, and I'm just more comfortable and familiar with them. macos makes a lot of choices for you, which is great when they're about stuff that you don't care about or isn't a deal-breaker. But if you're unlucky and one of those choices is a personal deal-breaker, then sometimes you can end up just having to rule out a macos machine.
