If I had to guess, this looks to be a strong candidate for the embedded OS market. There are still lots of folks running VxWorks, QNX, ThreadX, Mentor Graphics' Nucleus, Green Hills' Integrity.
In fact, it looks a lot like the same general design as Integrity, a microkernel capability-based architecture with as much as possible in user space.
I'm not so sure. Perhaps "embedded" is the wrong term, but more and more devices have full touchscreens on them, and if you are selling a high end device like a refrigerator, having the UI be fluid and feel high end is important as well. Not to mention TVs, car UIs, security system pads, and more.
Its rendering pipeline uses Vulkan which requires a very capable GPU. I'm sure you could put an expensive SoC into a refrigerator or TV, but it's going to cost you.
In fact, it looks a lot like the same general design as Integrity, a microkernel capability-based architecture with as much as possible in user space.