I grew up similar to what you described. My mom picked cotton as a kid so I've seen first hand how old timers save everything and it's rubbed off on me.
Luckily my dad had the skills to work his way out of the poor house so not all of my childhood was dirt poor.
I agree that most of these pack rats will die before they need what they have but we never know for sure. It's good for people to be overly self sufficient IMO. Venezuela was once fairly rich and prosperous. After the implosion, a carton of eggs cost $144 there. Now a political party here in the US wants to copy the Venezuela model. (insanity says they expect a different result) I think I'm going to channel my cotton picking ancestors and save everything I have, including guns and ammo. I'm agreeing with your observation, it hasn't mattered yet, but we know it still might matter at any time.