Longstanding issues that prevent usage? Not for me and the projects I’ve been apart of. No doubt there are plenty of reported issues, and no doubt they truly negatively impact some users, but I would still much rather choose the usability and stability of Elm 0.19.1-2 than anything in the typescript ecosystem today
When I worked on an Elm app in 2020, my users reported compatibility issues with various browser extensions (e.g. Grammarly, 1Password). I personally would prioritize making my apps usable for my users over making the DX usable for myself, so I stopped using Elm for future projects.
Well, you're suggesting a reason to choose Elm is stability - a lack of breaking changes. But Elm is actually notorious for its wildly unpopular, dramatic, community-fracturing breaking changes. Backwards compatibility is not a concern for them.
It's a little tricky though, because the comment you were replying to was talking about the lack of updates. And in that sense, Elm is now very stable - no breaking changes (or any changes at all!) in seven years and counting.
(Although, for all the complaints about the React ecosystem: you can still write class-style React components, even though they were effectively deprecated when hooks were introduced just over seven years ago.)
OTOH, we have this blog post suggesting development on Elm is kicking up again. Which means more breaking changes might be incoming.
I agree that the stability is quite nice. But there are plenty of areas where the language could use some improvement - for instance, the ergonomics around writing nested Single Page Apps is pretty cumbersome.