That's true and I could fit all my camping and climbing stuff in my car, but the picture I get from people who tout "all my stuff fits in my car" philosophy is

That's true and I could fit all my camping and climbing stuff in my car, but the picture I get from people who tout "all my stuff fits in my car" philosophy is that they live in a room with no furniture, a coffee mug and their laptop. Having less stuff for the sake of having less stuff doesn't seem to really serve a purposes. Keep what you need and want and ditch the rest. Not that complicated.