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Not backed up by data? Maybe because it's so easy to document that no one bothers to write about it?

Multithreaded IO-bound tasks don't care about the GIL.

Yeah the old implementations of the language were not as good as the latest. It doesn't seem right to criticize the language for problems that have already been fixed.

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"IO-bound multithreading is fine" has been the Python mantra for the last 20 years. Lo and behold, someone actually gathers some data and comes to find out that is absolutely wrong. For the last few years they've had a revamped version of the GIL, but that still has a burden of proof that can only be validated by profiling real-world applications.

A community can't make flat-out invalid claims for two decades and then expect everyone to take them at their word that everything is fine now.

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