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So the answer to your original question is, as stated elsewhere: Because it doesn't matter in many cases, and python is a way more user friendly language than most others. (Yes, this is debatable, and no, I won't debate this) When performance starts to matter I would probably go for rust today. It's fast, maintainable and has a very good ecosystem by now, even if initial development time is a little longer. https://actix.rs/ has come very far for example.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.