[droque]

The change they made was from a monad to an applicative, which is less "hands on", thus preferred. Kind of preferring map over hand-written loops. (Although the golfing is definitively there and in the community, see pointfree/pointless style https://wiki.haskell.org/Pointfree)

[le0n]

I prefer comprehensions over either mapping or explicit recursion. Mapping is a win for abstraction but a loss for clarity.