The problem is in doing concurrency for the sake of doing concurrency. There is no general purpose solution for concurrency, because concurrency is not a proble

The problem is in doing concurrency for the sake of doing concurrency. There is no general purpose solution for concurrency, because concurrency is not a problem to solve. You either need to scale and way beyond a bunch of cores you have on a single machine, so you go into distributed systems, or you don't need to scale, then you are fine with the single core, possibly with some primitive but safe abstractions for parallelism (not threads).