It works with windows 10 as well; it didn't like a lot of the older pdfs that were in my documents; and it didn't work offline. The last bit is probably the python dependencies trying to update themselves, but it doesn't fail gracefully into a working state when the network isn't available.
It means that they want people to consult the code as a reference for how to best use the hardware acceleration.
If all software uses their cards to best effect, that makes their cards more useful and thus more valuable; making them money. If only their own frontend can do that, they lose out on most of that, while also having to spend money to make sure that the rest of the software, like the UI, is competitive.