You want to sell Javascript based solutions, go for it. But don’t push this nonsense like “No language like Javascript”. The only reason Javascript has a wider adoption than others is because it’s forced upon us. Browsers understand just Javascript to display web pages, period. Doesn’t make it the best because of that reason. I say this as an experienced IT consultant managing a wide array of projects over my career across industries.
You know what usually bites me when I touch code that has not been touched for 6 months (usually a late contract renewal)? It’s not my Elixir or Ruby code that’s running on autopilot. It’s the stupid Javascript with its Node based dependencies all failing randomly in each direction just because some developer used a library for something trivial they could have written themselves or super likely because Babel or Webpack decided to change their config files so my entire JS pipeline breaks. JS is a language full of patchwork and its entire ecosystem, more so - it certainly has gotten better over the years. If it works for you, then great. But it’s a far cry from a “one solution for everything that’s better than everything else”.
Personally, I use Coffeescript. It has been a breeze from all aspects.