Earlier quoted context omitted.
But the Linux we use today isn't 20 year old software. Sure, the foundation is over 30 year old, but most of the Linux code we use today is relatively fresh and is constantly being improved and updated. Again, I bring the ship of Theseus argument. I doubt my Android phone has too many lines of code written by Linus on it. Not many places are running software that saw no more active development for over 20 years. Even…
bitrot is real. Is it comparable to actual food rot or the one way transformation of fossil fuels into energy? No.
Just look at my 10 year old Android phone. It still boots and works just fine, but having not received anymore SW updates for 8 years, it's completely unusable for its intended purpose today despite it still running. There's nothing wrong with the hardware, OLED screen is still very bright and sharp and I changed the battery and everything, but with such old unmaintained software it's basically an e-waste paperweight now.
Most software doesn't stay useful forever, and without updates it has a shelf-life, as most software becomes useless after a while if left un-updated. So yes, my point stands, old un-updated software provides no value in most cases.