No. I once used an obscure, powerful language that was the only language that offered a framework to solve a particular kind of problem. Other languages didn't offer it. It's probably because of how powerful the language was that it attracted the person that had written the framework.

I once also used an obscure, powerful language to solve a very common problem. The language helped me think better and I was able to find a simpler solution than the solution non-obscure, less powerful languages had found.

Maybe what to look for in a language isn't obscurity but power.