I agree with you in theory, but in practice when working on large teams, languages as flexible as CoffeeScript do become a problem. That's a major reason langua

I agree with you in theory, but in practice when working on large teams, languages as flexible as CoffeeScript do become a problem. That's a major reason languages like Java and even C# are so inflexible. For my personal projects or small teams I'd have no reservations using CoffeeScript if it felt like the best fit. For large teams, I'd reconsider.