This is a wholly false analogy. If I store most things properly they decay only very slowly and most maintenance tasks are easy. The software equivalent of that is only making sure I don't lose something to bit rot. No software lasts long enough for that, I look away for a year or so and someone broke something it stands on. It's not analogous to keeping an old book in a safe, it's analogous to keeping an old book in the street while random strangers queue up to piss on it.

I have books up to 500 years old that are perfectly readable. I have programs I wrote single digit years ago that I'd need to give up a couple of days just to find out if I can get their build chain back and dig them out of dependency hell. Not worth it to buy, at best, a few years before I get to repeat the experience. Restoring and rebuilding old physical things is also far more rewarding because when I do it properly I never have to do it again.