Are you saying that Fortran was once a general purpose programming language, but somehow changed to no longer be one?

Yes, because we are no longer in the 1960's - 1980's.

C and C++ took over many of the use cases people where using Fortran for during those decades.

In 2025, while it is a general purpose language, its use is constrained to scientific computing and HPC.

Most wannabe CUDA replacements keep forgetting Fortran is one of the reasons scientific community ignored OpenCL.