[ori_b]

Those languages are also well known for not handling multiple cpu bound threads well. (And for that matter, it's simply wrong about Python, which uses native threads, but locks very heavily: you need to write native code to use more than one core effectively from one process.)

The goal is to NOT do what you're suggesting. It's a holdover from when native threads were much more expensive than they are today, and multiple cores on a single cpu were rare.