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The ecosystem matters. I'm a developer and not a scientist, but having everything inside an environment that's at least workable is a huge boon.

Of course you could call the same functions from the ffi of any other language, but nobody does that for the same reason that nobody writes web applications in C.

I hate python, as far as I'm concerned it's a nightmare hell of a language that does everything wrong, and yet it's probably the language I use the most due to its sheer convenience and massive ecosystem.