An important advantage that doesn't get mentioned a lot is that modern Fortran (imo f90+) is much simpler to write and reason about that C++, precisely because

An important advantage that doesn't get mentioned a lot is that modern Fortran (imo f90+) is much simpler to write and reason about that C++, precisely because it limits what you can actually do in the language. That opens up the possibility for engineers and scientists to contribute to writing HPC code. If everything was in C++ then the ability to contribute would be available to a smaller number of capable programmers, and that's where Fortran still has a reasonable niche