Hoarding is a mental illness for sure but i don't think clutter classes as hoarding. Hoarding seriously fills your house to the point rooms are unusable and the hoarder becomes very emotional at the thought of letting anything go.
I think most mums on this thread were probably children of the 50s and 60s (i am a 60s child ) and were brought up to 'waste not, want not' 'never look a gift horse in the mouth' and all that.
Things were repaired because clothing was really expensive proportionate to income. Even kids' tights and socks were mended.
And there were tight times in the 70s and early 80s. Don't forget also, more people did trust to God and the church and wastefulness was almost sinful.
You never knew what hard times were around the corner. Hire purchase and credit was viewed with suspicion by many back then. If you did not have the money to buy outright, you went without.
Your Grandparents are likely born 40s? So war babies.
I think, with my generation, these problems with saving for a rainy day will die away.
I do have to say though in lockdown i never went near a supermarket for weeks! I emptied my cupboards and - omg - you should have seen what was there!!
A 60s shop! Evap milk, tinned fruit, condensed milk, every type of flour, sugar, spice and lots of old meat in the freezer. All the basics needed to make so many dishes!
It must be a subconscious thing. There were definite times in my childhood where we were very cold and hungry. So, when i see stuff on the news, i must assume all young folks are struggling!