When I realized this was performant enough to drive a 747's entire cockpit while the simulator moved along at a high FPS and with incredible visuals, and was now a thing that was being selected for "state of the art" AAA games ... from there I did my homework.
So that led to reading all about SpaceX Dragon UI, as you mention, and all the myraid of other places this is used.
I did feel like I was too far outside the loop, having been a software engineer and working with these technologies for quite a while by that point. "quite a while" being the pre-JavaScript-existing years.
I just wasn't working on projects that such a thing would meet a requirement.
Now? I still have no use for it but I find it incredible that everything in this entire pipeline has become so optimized and reliable. Apparently to the point you can suggest running a spacecraft's user interface and not leave everyone staring at you, blank-faced and not sure how to respond.
Instead, possible responses can now include "sounds good".