One of the companies I worked for used Elixir/Phoenix. It is an extremely cool piece of tech but it is nowhere near as productive as Laravel, Rails, etc. Missing libraries, difficult to hire for, bad editor support, and overall feels very niche which such a small community. That company eventually moved out of it.
Hey, that's why we need more people! It's getting better and better all the time. And nothing really beats its ease at making conncurent web apps. But yes, if you're an IDE person, you're going to have a bad time and that is not likely to chnage any time soon (I don't think?)