great if it works for you and all, but I still think this whole less stuff=more freedom is mostly just the flip side to the attitude that more stuff=better life. It's still assigning 'stuff' an importance beyond it that most of it does not have. It's not the ownership of Stuff that makes you who you are, and it's not its absence that helps you become (freer, more yourself, or whatever else). I know plenty of untidy, rather cluttered homes that house people who have a crystal-clear idea of who they are and where they want to be in life, and take steps to get there just fine, just like I know people with perfectly neat and uncluttered spaces who are totally stuck when it comes to those aspects. Heck, some of them I've 'met' right here!
While I don't reckon it's terribly functional to feel defined by what or how much you own, or by your capacity to acquire it, I don't think it's much of a step ahead to switch to assigning importance to what or how much you DON'T own (because you never did or because you used to do and got rid of it). In this forum, the first is mostly accepted de facto, but the second isn't really that much in the picture. Yeah, sometimes the process of uncluttering acts as a catalyst or as the physical accompaniment to internal/deeper processes of figuring yourself out, but that's all it is - the appetizer or the side dish, not the main dish :-)
I guess what I'm trying to say is that Stuff is kind of a neutral value. There's too much relativity about it (as in 'one person's clutter is another one's must-have', or even as in 'what's a must-have now can be clutter in a few years' time *to the same person*') to be anything else. sometimes people will try to bolster its meaning by having it piggyback onto other issues they hold dear that are more loaded with meaning, but it's often an uneasy, inadequate, or downright ambiguous fit.
Like, try environmental protection; you can say 'I am keeping all this stuff so I can reuse it someday and avoid wasting energy by buying newly manufactured items' just as well as you can say 'I am decluttering all this stuff so I can live in a smaller home and consume less energy to run it'. Decluttering in itself doesn't really affect environmental issues (or anything else OTHER than efficient housekeeping) either way :-)
Or take worrying about what happens to your loved ones when you're gone - unless you're an all-out hoarder, having less stuff to decide what to do with is not really gonna help them cope better, especially if you're gone suddenly. I mean, sorry to be morbid, but really, if I've read this once I've read it a hundred times around this whole site, and the ease with which this psychological absurdity meets with near-universal acceptance makes my skin itch :P