Lol no for your scenario you absolutely do. Do you think all the food and physical labor magically exists? Do you think people aren't going to want what someone else has if they have more "rewards"? Communism doesn't work, because we're are not ants... we're humans and humans are creatures that for the mass portion of the population will step on others to get what they want.
No we are not, sure in small numbers when small villages and tribes existed because they had to for survival. That shit isn't going to magically kick in when it's time for everyone to go harvest food. You have a very naive understanding of humans.
You don't have to be a Communist, just stop acting like you know what you're talking about when you make incorrect authoritative claims like "Communism assumes everyone works for the same outcome" and "Communism assumes people don't want more."
It's incredibly easy to not have opinions about subjects you don't understand, I encourage you to try!