Author here! I have finally come to realize why and where Python is required.

- Python is a fantastic frontend (glue) language that interop well with C/C++ libraries. This seamless binding is not natively available in languages in Go or Java or even JS.

- Python has an excellent data science / modelling / data engineering / ml ecosystem. There is no other language that comes close.

- Python is a fantastic MVP language. One can rapidly prototype and iterate and to a very good extend scale a product.