It is still very much used for weather forecasting (ECMWF has components in it), as well as materials physics, quantum chemistry, and things like finite element

It is still very much used for weather forecasting (ECMWF has components in it), as well as materials physics, quantum chemistry, and things like finite elements and nuclear fuel performance codes. It is much, much better than C for all these applications. Nobody in the field seriously considers C; all the non-Fortran codes are in C++. Both the Fortran and C++ bits have Python wrappers anyway.