In what ways? Bearing in mind it's still in development and doesn't claim to be production ready by any means.

Umm.. That's pretty damning. Why would a technology that isn't production ready yet be featured in a "most popular" list?

In my experience there’s a difference between being production ready and claiming to be production ready.

Quite a few projects (Node.js and Backbone) achieved wide adoption before 1.0.0.

For the record I’m not sure the Elm project has any claim one way or another, apart from the current version of 0.18 and the main contributors having large code bases in production at private companies.

So maybe it’s not that damning, and we still haven’t heard the GPs thoughts on how Elm has fallen short for them.