For me, I reckon I could do away with about 90% of the stuff that's cluttering up my house and I wouldn't miss any of it!
We have too much stuff! Some of it accumulated by us over 40+ years of marriage (almost 40 of them in our current house, so we haven't had to have a good clear out for decades). Some of it is from my parents' house and some from DH's parents (all parents passed away a few years back).
I keep chucking stuff out, but the clutter never seems to get any less!