[lobrien]

I'm no believer in silver bullets, but I wonder about "the productivity difference is only marginal." For one thing, I think being an F# dev is likely to improve one's OOP code (immutability by default, smaller methods), so while I agree that it might feel like one is similarly productive, I think one changes one's baseline.

For another, I think it really boils down to maintainability. Elsewhere in this thread, there is a comment that "return to your code in 6 months and it's incomprehensible." As a guy who worked with a large Scala codebase, I totally "get" that, but the thing with "functional code you haven't seen in 6 months" is: It's either incomprehensible or it's MUCH easier to reason about than stateful OOP code. And the "incomprehensible" stuff tends to fall into a couple different categories (lifting and conversion, complex function composition, etc.) that gets at least a _little_ better once you've hit your head against them a few times.