[MehdiHK]

> If you need true multithreading

I didn't say multithreading anywhere. Mutitasking (concurrency) != Multithreading.

You can do pre-emptive concurrency with a single thread in other runtimes, where each task gets a pre-defined amount of CPU time slice, that solves fair scheduling for both IO and CPU-bound workloads. Nobody is supposed to pick NodeJS for CPU-bound workload, but you cannot escape JSON parse/stringify event-loop blocking in practice (which is CPU-bound).