I don't think the world where a mob of people can gang up on a person and take their stuff is as idyllic as you think it is. If the person who has figured out how to earn a lot of food doesn't get to "hoard" it, it'll just get hoarded by a person with the biggest stick.
What's worse (for the society), is that in this world nobody has an incentive to create wealth, because they know it'll just be taken away. When rich people aren't in power, people with political capital and big guns are. I don't think that's better.
If AGI takes over, that changes things, somewhat. If it creates unlimited abundance, then it shouldn't matter who has the most (if everyone has plenty). Yes, it would create power disparity, but the thing is, there'll always be SOMEBODY at the top of the social hierarchy, with most of the money and power - in the AGI scenario, that is someone who is in charge of AGI's actions.
Either it's AGI itself (in which case all bets are off, since it's an alien god we cannot control), or the people who have developed AGI, or the politicians who have nationalized it.
Personally, I'm uncomfortable with anyone having that much power, but if I had to pick the lesser evil - I'd prefer it to be a CEO of an AI company (who, at least, had the competence and skill to create it), instead of the AGI itself (who has no reason to care about us unless we solve alignment), or one of the political world leaders (all of whom seem actively insane and/or evil).