> Did I miss something important that should be covered?
Accessibility. Outside of that everything seems reasonable. But I don't know much about cross-platforms GUI. I expect someone will come and explain that Delphi or something like that already does everything the author wants except for the integration with Clojure.
I would add that I'm not sure which value Clojure provides here. Does the REPL adds anything to the live-reload environment? If not, the choice of Clojure seems to be arbitrary.
The work is funded by a Clojure community group (and a Clojure-using company), and Tonsky has written a bunch of awesome other Clojure (see DataScript[1]).
So it seems as though the decision to use Clojure was not made for technical reasons, but it's not exactly arbitrary.