What's wrong with FORTRAN?
All of these languages are Turing complete. So ultimately, if you're happy writing code in some language and don't want to change, that's your choice. But the reason Fortran or C or C++ isn't many people's first choice for new projects are closely related to the reasons I've mentioned. There will always be people who want to stick to what they know, but it's not only science that advances one funeral at a time.
And what makes you think today's "principled designs" won't get the boot a few years down the line too? These things are cyclical and rarely based on any real mathematical reasoning.
There are more factors to language use than design pattern fads. Like efficiency for example, which almost any modern garbage collected or managed language cannot meet beyond a certain level. And that usually gets worse the more "powerful abstractions" one adds. I want to learn FORTRAN because I have been told it has real benefits in terms of ergonomics for efficient code, ie normal looking FORTRAN code is faster than normal looking C/C++/Rust.
Efficiency is a real, concrete and measurable quantity. It is not subject to the fad of the day.
It's a different way of thinking about languages than most people usually do, but it's been true for FORTRAN since the 1950s and is true to some extent of every language with multiple implementations today.