Yeah, I agree on the "post-scarcity" argument. That seems to make most of the socialist/communist theories completely worthless, in my opinion. It's great to dream about it, but it's nowhere close to being a realistic possibility.
But even shared property use doesn't address the management/maintenance of it, any exclusion from use by either inside or outside actors, and the rules created for it all in the first place. Democratic decision-making and enforcement presupposes some sort of unanimous agreement to the rules of voting beforehand, which is almost never actually proven in any "democratic" society. It just seems to me that any decentralization claims by those with centralized "democratic resolution" processes are completely contradictory. Property rights seems to be the only way that any centralization can actually be avoided in both theory and practice.
i lived now for 5 years mostly in a community without money. Of course to get used to it can be quite tricky, but i for my part don't want to miss it. Its functioning very simple, the ones who take care of something make the decision about it. Thats it.