UPD: please don't downvote me, I am on spectrum
We do not like, and eventually will not tolerate, people who do not contribute a certain amount to the tribe. Members of the tribe that could not, or would not, contribute we banished to exile to die in the wilderness.
This is why Communism in any form cannot and will not work. There has never been, and will never be, a perfectly equal distribution of work amongst the people in a tribe, a village, a town, a city, a state, a nation. You cannot distribute equal resources for unequal effort and expect cohesion.
But I agree that it's of course strange, for example, why would the builder of the house get the part of profits of the house after it's built? It's also a bit not fair