Just delegating responsibility for resource allocation to groups of people is not a silver bullet.

"Aggregate people" tasked with distributing wealth (or taking wealth and converting it to some resource and distributing that) seems to be highly succeptable to holding onto more and more of that wealth over time for trickle down distribution within it's own organization.

Large nonprofits regularly come under fire for using too much of their income on their leadership and luxury fluff for themselves. Governments routinely spend their income paying themselves and paying for pork for their friends and paying for fluff instead of making people's lives good. Religions tend to amass more and more wealth until some sub-group tells them to shove it and historically this results in violence. You could fill libraries with the volume of work written about all the ways organizations become corrupted and self serving and fail to achieve their goal.