Fortran is super fast. For math/analytical stuff it's preffered over C. But to avoid relyance on a language with so few devs, these orgs dhould only have code that the the heavy lifting math in fortran. And use expose those as wrspped functions to some other more common and easier to use/mantain/hire

Indeed - with its stricter semantics Fortran is much easier for the compiler to generate a highly optimized machine code for.