I run Antergos on a Macbook Pro with a HiDPI screen - with a custom compiled kernel. Things work really, really well... until I plug it into a monitor. Linux can't really deal with one screen being high resolution and another screen being 'low' resolution. Icons distort into different sizes and what not. Chrome's window decorations blow up to humongous sizes, etc. Unplugging it and having the screen readjust leaves things pretty broken. It is easier to run the Macbook screen at 1920x1080 just to not have to deal with scaling issues.