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Development speed in Go blows Python out of the water when approaching the project as an engineering project, but Python has it beat when approaching the project as a computer science project.

And therein lies the rub for anything that is pushing the modernity of computer science (AI/ML, DSP, etc.) When born in the computer science domain, much of the preexisting work able to be leveraged is going to be built around Python, not Go (or any other language, for that matter), and it takes a lot of work to bring that to another system.

It is pretty clear that just about anything other than Python is used in engineering when the science end is already well explored and the aforementioned work has already been done, but the available libraries are Python's selling feature otherwise.