From my point of view (and I posted the same thing in another thread about Elm https://news.ycombinator.com/item?id=11667799 and the mailing list post that sums up better https://groups.google.com/forum/#!topic/elm-discuss/AmxE3qAm...) it's that it still seems driven by a single person.

I understand why but in the meantime I'll use something else and will try it again once it's more open.