I also cannot wait until the hopeful switch to Wayland so we can have multiple DPI displays running together.
Anyway, they at least work really hard to make a good HiDPI experience.
It of course means having to know how to install them and deal with any issues, but it's not been particularly hard.
To make that happen, I created something that I like to call Yabbos: Yet another browser-based operating system.
It has also gone by another name with a reference to Linux, but I got bored of that name after a couple of years of staring at it.
But no. Instead, they invented yet another wheel...
There's a custom set of desktop apps built using a their own language, Vala.
They also have a pay what you want app store to support and all apps there are FOSS.