HN user
Works fairly well on iPhone. Just tried on Android emulator (don't have an actual phone handy)... loaded it up as a web app and also did a trigger.io android build. Some minor css issues, and it looks like it's getting a bunch of extra space at the end of the content area that isn't happening in desktop chrome or on ios though...
To broadly say that "art" is purely subjective and UI/UX is not is just a bad analogy. No matter what form of art you are doing, whether it is the art of UI/UX, painting, composing music -- the professionals of the trade use experience, technique and other tools to create more sophisticated designs that work and are successful because of the use of those tools and the planning/science behind their method. A more appropriate analogy would be to craft or hobby work, not "art."