This article is wrong on so many levels...

- It implies that async execution is equivalent to callback hell. In reality there are excellent ways to have async code which looks just like sync (generators, async/await).

- It benchmarks multi-core (sync) vs single-core (async) and makes claims based on the results.

- It presents async execution as an antipode of clustering. In reality it's a best practice to make use of both.

...and everything that follows is just irrelevant.