I think we should remember that attitudes to 'stuff' get ingrained in childhood, and change over time. Someone brought up without a lot of things (whether because of scarcity or poverty) is likely to have a different view from someone who was indulged as a child.
I grew up in the 60s, when things were gradually becoming more readily available than they had been for my parents, who were born in 1935. All the same, we got toys at Christmas and birthdays, and clothes when we had grown out of existing ones. There was very little outside of that, so we hung onto as much as possible, knowing that there wouldn't be a new one if something got lost or broken, and that's where the 'just in case' mentality comes from. My parents were children during the war, and of course there was rationing for years after that, so they had ingrained ideas about waste and 'need not want' that they passed onto us. I still struggle to throw away something that might come in handy, even though the reality is that I could get a new one if I found that I needed something. My head tells me one thing, but my upbringing and conditioning tell me another.
My children grew up in the 90s, and had a lot more than I did. They don't hang onto things in the same way, - in fact they can be quite ruthless. They are also very good at saying 'No Mum, I don't want your old pots and pans, and please don't hang onto those hideous onion jars (Sylvac Face Pots) on my account - they are going in a skip when you're gone
.' They know they can get more of what they need, and don't have that guilt about hanging onto things whether they really like them or not.
I am conflicted, as I am very conscious that the world needs less 'stuff', and living a more streamlined life is better for both the planet and my own mental health, but the habits of a lifetime are very hard to shift. Giving to charity shops is one way of feeling better about it. I've forced myself to get rid of lots of evening wear that (a) doesn't fit any more, and (b) I don't get the same chance to wear as I used to. At this time of year it might be worn with pleasure by someone, and it's not going to landfill. I have no desire to buy any more, but if Prince Charming ever sends me an invitation to the ball I can get a new gown, and buy something that fits properly - I really won't have to go in rags, and I need to remember that. Now if I could apply that thinking to books (I can get another copy if I really want to read something again) I would have even more space cleared.