[pmattos]

I agree with the OP. This has been called the Lisp Curse elsewhere. Over time, your codebase becomes so high-level, full of advanced, domain-centric abstractions that basically alienates everyone else from effectively working on the project.

If you have a small, stable team that such issue might be relatively easy to overcome. But with bigger teams, with higher turnover, than it might totally cancel out any technical advantage gained from using such non-mainstream programming languages.