I would argue the opposite! The elm slack is very active with people who frequently contribute to the ecosystem. I don't think the "a lot of libraries aren't updated to the last lang version" is true, the vast majority are.

Debugging elm-JS interactions is not really a problem when using the standard interop methods of ports and webcomponents. It's just not something that comes up often.

Source: have been writing elm professionally for the last 2 and a half years.