Am I the only one having bad flashbacks to Occam, here? (Transputing Will Change Everything!)
My $0.02, FWIW: Concurrency is surprising. Humans don't think that way. And programs aren't written that way - any program represented as a byte stream is inherently sequential in nature. Where the system can detect opportunities for parallel execution, great, but you have to be careful. Automatic concurrency should only happen when it doesn't change the results at all (apart from making them appear faster). When I want things to be explicitly parallel in a way that can interfere with the apparent flow of execution, that should be a Big Red Blinking Border around the code, not something subtle like "forall" instead of "foreach" or doubled curlies.
