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What you describe is something I can relate to very well. But in my opinion you are describing something that is quite common for older people. They tend to save more than the younger generations do today. In relative terms of course to their income. A bad consequence that often occurs when older people save a lot of money or keep valuable assets like jewelry or art is that children and even grand children might end up fighting for it and not trust each other. That is particularly the case when there is no well defined last will. That doesn't mean saving is bad because people could be fighting about it. It rather means that with lots of savings still comes some responsibility.
When you watch someone saving so much and they just stay home for the sake of saving more without exploring the world or having a hobby, then I am totally with you in that they are too stingy with themselves. It is almost sad to see if someone has the possibility to live a great life but psychologically feel the urge to restrict themselves. It shouldn't be that way, but then again if it helps those people living a life without stress and feeling comfortable, I guess there isn't really anything you can blame them for.
i'm sure people who, as i said, have excessive fear because they (old people over 70 years old) have gone through difficult times during wars and economic revolutions in their respective countries so the trauma made them try hard to collect as much money and property as possible so that in the future he/her and his/her family will not have economic difficulties, but the long-term effects are worse because now times have changed, even though there is a potential for war or a pandemic, it won't last long. i emphatically say that saving is very important and must be owned by everyone, but hoarding money and assets without ever touching or using it is a very bad thing.
I would say there is a difference between money (if you refer to fiat currencies) and assets when it comes to hiding it under your pillow until you die. If you hold assets like art or perhaps gold, or Bitcoin for that matter
, the bad part in terms of inflation doesn't have as much influence on the overall equation. At least it is not "a very bad thing" anymore, as you put it. Some just feel comfortable owning stuff without using it.
Hiding a ton of cash in your basement for decades is bad because you as an individual will suffer from devaluation through inflation and you also drain that money from circulation, making less funds available for investment, which in turn incentivizes banks to print more, thereby devaluing whatever you have in your basement.
But honestly I think that many of the older people are literate enough to understand the full consequences. But I think that will change now with the next generations. Saving cash was the first choice for many people for a very long time to build up a savings portfolio. When I just look around me and observe the younger people from today, there are so many more saving some money in the form of stocks than there were 15 or even 20 years ago.
Now fiat currencies can also make sense when you do a certain minimum of investigation and hold maybe some Swiss Francs, not just cash in your home currency for the sake of saving.