> it can be said not everyone learns equally well every language, and not every language is equally as learnable. I think that’s reasonable, but the question i

> it can be said not everyone learns equally well every language, and not every language is equally as learnable. I think that’s reasonable, but the question is then at what point does a language become sufficiently difficult that it no longer provides a good return on investment? And to what degree of proficiency must one achieve in a language in order to productively use it? It doesn’t take a long time to learn all of Elm, and you can be productive in it quickly. It takes a very long time to learn all of Haskell, but it does not take a very long time to be productive with it.