The big difference is that generic dispatch is resolved dynamically. I haven't yet found myself reaching for monads in Racket (or writing much non-Redex Racket

The big difference is that generic dispatch is resolved dynamically. I haven't yet found myself reaching for monads in Racket (or writing much non-Redex Racket code) since tonyg wrote that post, so I don't know if there are any odd interactions to watch out for.