If I understand correctly, the way to build a parallel system is to have everything concurrent by default and then specify the specific parts that are sequential. Just like to build a secure system, you have to disallow everything by default and then specify the specific operations that are allowed.
Sorta. I'd have preferred to see an example or two.
The problem is that "sequential" vs. "concurrent" isn't solely an implementaion choice. It's a property of the problem. Some problems are inherently sequential, and can't be meaningfully scaled to an arbitrary number of cores. So color me skeptical, basically. Concurrency is hard because it is hard. While there may be a paradigm out there that makes it less so, I'm going to need to see it in operation before I make any judgements.
Makes sense!