Humanity always strives for more and better. There are entire fields left untouched. We have an entire galaxy to explore.
Dare I say:
"Ownership" was never in the hands of "the people". Property rights are not just something important. It is everything. It is the only important thing. Its the fabric of human civilisation.
Its impossible to have a functioning society with out and I mean that in the literal sense.
Even under your utopia, you will still have property rights, its just dictated by "the proletariat".
What this looks like in real life is, you replace a decentralised ledger of human value with a centralised ledger managed by the AOCs and Bernies of the world.
In other words, you just replaced our current class of elites who (somewhat) earned their station with a new class of elites that just so happened have the gift of gab.
To make it worse, the power of our current elites is scoped and limited whereas this new class of elites will have an order of magnitude more power and there will be no limit.
A cautionary tale I remember vividly from a guy I met in Miami: He is from Venuezuala, his dad used have an energy drinks company. They lost it all and know he is a refugee in America. The one thing I remember him telling me is why the people don't rise up against Maduro: You don't bite the hand that feeds you.
Maduro took everything from them but they still support him for the rotten food he gives them from AID. In your utopia, those hands will be AOCs (bartender) and Bernies (Hippie whos never worked a real job).
Don't you see how the structure is fundamentally unstable? Think of it in computer terms, it will be the equivalent of creating a quantum Artificial Super Intelligence that is capable of calculating the actions needed to be taken by hundreds of millions of Americans to create the most perfect outcome.
Now replace quantum ASI with AOC (former bartender) and Bernie Sanders (former & current hippie because he's never had a real job). Even a strongman case like China where there is still quasi private ownership and the central committee selects actual competent people, even there the whole system is full of death star vulnerabilities (ghost cities, population implosion).