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.
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.
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.
But no. Instead, they invented yet another wheel...
