Honestly, no I’m far from an expert in political or economic matters. I’m just yet to see a system proposed that could work in reality given how complex humans are and how “value” is almost impossible to define when everyone sees it differently.
Plenty of countries have tried though and none have made it work from what I’ve seen. This is possibly (probably) a gross oversimplification but ultimately someone (or some group) ends up at the top of the tree and unless that group is uncorruptable forever it ends with imbalance.
Asking everyone to share as needed and own nothing would be great if everyone wanted everyone else to be equally happy and nobody was trying to take more for themselves (and if everyone had the same idea of what everything is worth). I think at the very least we can agree that some people are more selfless than others and other people will always exploit that given an opportunity.