> Lately I've confirmed its because they know exactly 1 language , but they know it so well & in so much depth, they know exactly where to look, the right mcmc

> Lately I've confirmed its because they know exactly 1 language , but they know it so well & in so much depth, they know exactly where to look, the right mcmc library, the right slice sampler, the right optimizer, that's what matters. That sounds like your "issue" isn't knowing too many languages but that you don't know any one language as in depth as they do though? I don't see why you'd want to unlearn anything.. doesn't that knowledge only help? I think there are benefits to learning more languages but also support the idea you should have at least one you're super comfortable with.. thats not mutually exclusive!