> it's very useable even if I don't

That really depends on what you mean by Linux. A feature-rich desktop Linux like Ubuntu, Fedora or openSUSE? These are comparable to MacOS: You may like the defaults, you may not, but the premise is the same.

If you’re using anything highly customisable, chances are you have to tweak the system, otherwise there is no system. E.g. Arch not shipping with X11/Wayland by default.

The MacOS UI is one of the better desktop environments I’ve encountered and I prefer it over almost any non-tiling desktop environment in Linux. Only i3, xmonad, etc. have a better setup, in my experience, but they require installing and customising.