I like Elm as a language, but the community is extremely toxic, and it's not production-ready yet (version < 1.0, one-person project). Too bad, because it's a great project.
This is FUD. Elm is being used pretty successfully in production.
This is not something you can afford to do with a long-running, critical app, or at least you have to know you're taking some risks. It's a tradeoff.
Also, what would happen to Elm if the author suddenly died?
now he alone does not make up the "community", but he's certainly a prominent member of it.
And the github forum rules are a little "threatening" (https://github.com/elm/forum-rules/blob/master/README.md).