It’s because most of the people doing these computations don’t have the capacity to become experts in multiple fields. They understand the math and analytics very well, and they expend all their time thinking about that, not about type systems, memory management, etc. Python lets them code without having to think about a lot of that stuff so they can focus on the things they care about. These aren’t computer scientists or programmers, they’re meteorologists, astronomers, oil and gas analysts, investment bankers etc. That’s why some truly great computer scientists and programmers invested their time into building these tools for python vs other languages.