However, at my previous job I integrated an LFBGS[1] implementation into our production code.
That was written in the early 80s in Fortran '77.
The code outlived all hardware that it ran on when it was first written (we ran it on an OpenMP cluster for a scientific-computing problem related to lithographic mask optimization), if not its authors.
It will continue to exist, and run, for a very long time.
Sure, all software is ephemeral. But as you say so, you probably used SciPy/NumPy. Deep inside, there's an implementation of LAPACK/BLAS doing the heavy lifting for you[2]. It started in 1979, and is still kicking.
(And it's still in FORTRAN)
[1]https://en.wikipedia.org/wiki/Limited-memory_BFGS
[2]https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprogra...
Obviously it won't outlast the heat death of the universe or anything, but I'd say it's has the potential to live as long as any other human creation.
I know, far out there and in theory, I agree with you, everything is temporary and nothing is forever. But who knows, maybe in the future, things will no longer be ephemeral.
The alternative is to face how insanely unfair and belittling it is to have bought an app and a device and due to circumstances out of your control arbitrarily no longer be permitted to run “your” app on “your” device.
I fully expect the last computer to ever be built by humans to still be able to load original .wads.