It seems like you should really just buy a MacBook Pro. Sure the software isn't perfect, but it's an order of magnitude closer to perfect than Windows has been lately. You buy it, boot it up, and it works wonderfully. Of course the one day out of the year that it doesn't you go rage comment on how it sucks and it scares Windows users away from Mac, but the rest of the time you'd never consider going back to a typical…
The external keyboard uses a non standard USB port. That's broken.
It's not easy to maximise a window fully. Apparently I'm not supposed to do this, but I don't like being told how I'm supposed to use a computer.
Focus follows mouse can't be done.
There are very few ways the window manager can be customised.
Homebrew lacks many packages. Coming from Debian / Ubuntu, the package repository was always the first place to look when I needed some software.
The window manager plus homebrew pushed me to using Kubuntu after a month. It doesn't yet support using a high dpi display at the same time as a normal, external display, but that's all.