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I find that "what can I do with the value" is a lot more important than "what the object is". Especially in scientific context this is usually "can I iterate this" "can I do arithmetic with this" etc. NumPy's broadcasting and support for "any" iterables is a great example of this. And very difficult to accomplish with at least the typesystems you listed.

E.g. going from a nested list in a JSON to a Eigen matrix is quite a pain even with (awesome) libraries like nlohmann/json.

I often have to resort to C++ for performance or libraries. I make a lot more bugs than in Python. And the bugs are often really tricky and often pass the typesystem (e.g. both nlohmann and Eigen have to really hack the templates and these cause a lot of edge cases).

Also serializing stuff in C++ is a real pain even with nlohmann/json because for god's sake there's still no reflection in C++ in 2024.

Of course you can abuse the power of dynamic typing. But you can just as well abuse anything else that's remotely powerful (see e.g. Boost).




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