As someone who’s been involved in both, it’s not like the language you pick doesn’t make a difference, but I’d say that there are other factors that vastly overshadow it.

For example, one thing we were told when choosing to write in a lisp was that we’d have problems finding developers. It turned out to be true in that we received fewer applications, but compared to the same process with a more mainstream language, I’d say the applicants were on average of higher quality. So by the final step, we were approximately considering the same number of résumés in both cases.

But in the end, the language is not what has made the biggest impact. It’s been other, more universally applicable things, such as team dynamics and communication, clarity of vision and consistency in execution, process and planning, and a ton of other things where the particular language is not a factor.