Glad to see more posts on Elm out there, it really is a great language and ecosystem! Like any large project, it has some issues, but in my day-to-day writing code I have never had as much fun, or had as much confidence that my code does what it says on the tin, as I have with Elm.
I wanted to give a shout out to one of Jeroen's other projects in the Elm ecosystem, elm-review (https://package.elm-lang.org/packages/jfmengels/elm-review/l...), it is an excellent linter/fixer and allows writing your own rules as well.