One of the questions I always ask with endeavours like that is 'does it scale'.
If everybody adopted this then pretty soon there would be no more roads, no more people to discard anything and so on. So even though I think this is quite the statement against consumerism I don't think it survives the 'does it scale' test.
It's similar to how people in the UK live in 'eco-villages' that live of the discards of the rest of the society around them.
My understanding is that his goal is to show consumerism is overblown. He does so by taking it to extremes. You need one for such causes (like stallman who takes a completely overblown stance by not using anything non-free). And not that his way of life is what everyone should follow.
Attack the ideas and not the person, the sleeping in the office and bathing thing has been beaten to death many times over and has very little to do with the open source ideas that Stallman has been relentlessly promoting. Effectively he's given up a normal life in order to do this promotion. You could for the same money laugh hard at the military, monks and anybody else that has given up the comforts of regular life in order to commit to a life of service (whether or not I agree with any of those is besides the point, it's just that once you decide your vocation matters more than you do that luxuries cease to matter).
Stallmans ideas are very much worth all our attention and his service has brought us as an industry enormous benefits.
My intuition is that if you really universalized this, everything is discarded and the idea of ownership would have to change.
How would pragmatically work, I don't know (probably terribly), but a maxim in which everyone suddenly stopped owning things beyond personal possessions at the same time took up an overriding ethical system which privileged ecology at least initially seems to be univeralizible.
At least, it seems to "scale" better than "I will declare this land as mine to own and control even when I don't actively use it", which is one of our current maxims.
If everybody adopted this then pretty soon there would be no more roads, no more people to discard anything and so on. So even though I think this is quite the statement against consumerism I don't think it survives the 'does it scale' test.
It's similar to how people in the UK live in 'eco-villages' that live of the discards of the rest of the society around them.