[Haskell-cafe] Seen on reddit: or, foldl and foldr considered slightly harmful

In a presentation of Guy Steele for ICFP 2009 in Edinburgh: http://www.vimeo.com/6624203 he "considers foldl and foldr" harmful as they hinder parallelism because of "Process first element, then the rest" Instead he proposes a divide and merge aproach, especially in the light of going parallel. The slides at http://docs.google.com/viewer?url=http%3A%2F%2Fresearch.sun.com%2Fprojects%2... [Bware: Google docs] are somewhat geared towards Fortress, but I wonder what Haskellers have to say about his position. Greetings, Johann