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If every OS required async calls, it would require every developer to learn async programming. They probably wouldn't learn it properly, and you'd end up with m

• CodeWriter23 8y ago
  Closures/blocks really make it a lot easier to follow the flow of async coding. Async style enforces a kind of minimalism that in my opinion simplifies the problem space overall. Obviously, one has to learn different approaches to problem definition and solution to embrace event-driven coding. To me, in the comparison of linear programming handling an exception when your call stack is 5 levels deep (or maybe 3 in a different use case), having to bubble the appropriate handling at each of those levels, versus async where in your closure you have a 4-line if/else construct that fires off one event for success and a different event for failure, async wins the simplicity competition every time. If race conditions are an issue, events should be dispatched through a single-threaded finite state machine dispatcher for resolution. Such events can fire up multiple worker threads to do their bidding, but when state changes, that goes through the dispatcher which inherently resolves all races.