Question: Do you need less stuff or more places?
Answer: A little of both.

Others hang on to stuff for decades because they might need it someday. To be clear, I'm not talking about hoarders like you see on TV who keep everything that comes into their house, including trash, and things used up or broken beyond repair.
I have things packed away that I don't use. Do they take up space? Yes. Should I get rid of them? Some would say yes, and in time I may...when I can let go.
Do we have more everything than places? Yes. Is it junk? No. Hubby has a project he's working on. He needs something, goes into the basement and voila, he finds something that fills the bill. It is likely something that I would have thrown out years ago.
Just this past weekend I was making something and I needed some double-sided tape. I went down to a shelf in the basement and rummaged through a box of all kinds of tape I'd brought from my parents' house years ago. I found what I needed and finished my project.
So while there are extremes on both sides, and as much as we strive to maintain the balance, we always have more everything than places.