[dragonwriter]

That's true (and, heck, its true even of many static languages that support monads; that feature of Haskell is due to its better-than-most type inference, not just having static typing), but I don't see how that limits the capacity for abstraction. Certainly, you may need an additional explicit parameter in some cases rather than effectively implicitly supplying information via type inference, but that doesn't change the level of abstraction.