Yes, especially on Mac, high DPI on Linux is still garbage to this day. It's not really good on Windows either, but at least with Windows 10, it is somewhat serviceable. On Linux, support is so abysmal, it is really comical in 2018. Moreover, it seems the dev community still hasn't "seen the light" in high DPI displays, and will often dismiss or backlog required changes for support. In 2018.
HiDPI worked / works great in UbuntuGNOME. I spend most of my time in a text editor, terminal or browser, but even things like games for my kid (Tux and Tux Kart) supported HiDPI without requiring any magic tricks.
/edit setting a different scalefactor on my external (non-HiDPI) monitor was frustrating in that it worked... sometimes
I had to install a webcam driver but other than that everything just worked(TM)