I mostly agree with you, but...
As for the resistance of venerable old masters to threading, you'll have to ask them to know for sure, but in part it may be because the early threading libraries on *nix were rubbish; in part because it means learning something new.
Separate address spaces with explicit sharing are much easier to reason about than a single address space with implicit sharing. Accepting the latter in exchange for faster context switches is often a mistake.

In reply to Re^2: how did blocking IO become such a problem? by educated_foo
in thread how did blocking IO become such a problem? by zentara

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