Because it's a niche? You don't need async for most stuff Python is used for, it's a "nice-to-have", and it's annoying to add. If you have to have concurrency/threading/etc, there are other languages with better paradigms.
The same thing happened with Perl and its weird threading (for different reasons, but still)... I guess Python didn't learn that lesson. Perl also gained async and coroutine support, but I think they were added a while after I left the community. I doubt many people use them today. Anyone used them and can comment on ease vs Python?
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