I agree on concurrency. It is best in class and also offers a lot of choice (which some other popular languages like JS and Go are not providing). When it come

I agree on concurrency. It is best in class and also offers a lot of choice (which some other popular languages like JS and Go are not providing). When it comes to IDEs I do think immature would also be my choice. There is a lot of movement on this front so I have hopes this may change soon. My main points are: 7.10 is out for a while but most editor integrations have/had (until recently) some major issues with it. Also Stack is bocoming quite popular, yet most editor integrations are not Stack-aware. Finally the editor integrations are not much plug-and-play. As said, this is changing rapidly with some necessary fixes to GHC/cabal made and projects like stack-ide and ghci-ng.