Which will give developers a better return on productivity?
200 hours spent learning Haskell or 200 hours spent learning more about the business domain they work in?
200 hours spent learning Haskell or 200 hours spent improving their soft skills?
200 hours spent learning Haskell or 200 hours spent networking?
Etc.
Though, will 200 hours spent learning Haskell gain you, well, anything productive?
Surely a non-genius would require at least 1000.
Which will give developers a better return on productivity?
200 hours spent learning Haskell or 200 hours spent learning more about the business domain they work in?
200 hours spent learning Haskell or 200 hours spent improving their soft skills?
200 hours spent learning Haskell or 200 hours spent networking?
Etc.