I'm curious, are there languages that are better suited for specific things? If you knew every language on earth fluently, would you choose one to communicate the nuances of an emotion, or the inner workings of a car engine?

Not just vocabulary (though that probably plays a part) but grammatical structure, communication efficiency, logical clarity, etc...

Another framing, what do you miss from your native language? Fluency aside, what is harder to communicate in other languages?