"Across the whole OS" is nothing special, it just means there hasn't been enough interest by diverse enough users of the OS. This is a research system, which is

"Across the whole OS" is nothing special, it just means there hasn't been enough interest by diverse enough users of the OS. This is a research system, which is different from an OS supporting a huge diversity of ecosystems through the past 3 decades or so. There are different forces at play. I'm sure there are quite a few systems worked on by lone developers today that make for a nice and smooth demo. The hard part is getting adoption and making it ergonomic and performant for a variety of uses, not just demo stuff.