Those guts that 'actually perform numerical calculations' as referenced by the above post are not only imperative, they're in Fortran, the language of Real Prog

Those guts that 'actually perform numerical calculations' as referenced by the above post are not only imperative, they're in Fortran, the language of Real Programmers. Many packages have successfully used FP as a layer over those calculations, but that doesn't invalidate the original point you're replying to. Calling functions to add numbers is in fact that worst possible paradigm for performing the actual numerics.