So the idea that most of it is worthless is far far less justification to toss the entire pile. The cost to benefit ratio is shifted by more than 1000x.
And even then, while cleaning out a physical hoard you'll take time to look through things.
I live and hoard long enough to know I rarely look back to stuff I've saved, things that I hope it will spark my creativity someday, never arrives (except for some really rare case, which is like 'hey, I remember this...,cool', you relish the nostalgia for a bit and then you move on eventually)
I agree with you that even digital stuff took toll on your mind. I remember the sadness but then big relief when my old HDD gone, along with stuffs. The thought that I don't have to worry about it anymore is a plus in itself.