"Hang onto things" Now there is a loaded expression, with overtones of desperation.
Not everyone is about to pop their clogs, I personally have every intention of living for at least another 15 years, and given my general good heath and the example of previous generations, I stand a good chance of doing so. I don't want to spend those years wishing I hadn't got rid of my things because I have been told I ought to, and frankly I feel rather oppressed by being told so often that I must declutter for the sake of those who will have to clear up after me.
This is MY life, and I haven't finished with it yet, so I am not packing my bags too soon. It is not yet time to throw out all the bits and pieces that I might want or need in those coming years. When that time comes, I shall recognise it, until then I would rather keep them, thank you very much.