Of those examples only Jak and Dexter is actually about functional programming in game dev. It's a good example though. But the outcome of using FP didn't turn

Of those examples only Jak and Dexter is actually about functional programming in game dev. It's a good example though. But the outcome of using FP didn't turn out that great for them, it did not make them more productive: A single programmer (who could easily be one of the top ten Lisp programmers in the world) wrote GOAL. While he called his Lisp techniques and programming practices "revolutionary," others referred to them as "code encryption," since only he could understand them. So we found one example, and it didn't prove FP is beneficial to productivity.