And yet, there's incentive for somebody (say, in soccer) to try and score a goal even tho it's not their role - because scoring a goal is rewarded to the individual.

Individual coders/contributors' compensation don't scale until they are shown to "score a goal". And yet, to do so, they may have to stop contributing in their usual, assigned role, but go "above and beyond" - such as redesigning the system, or to make their mark on the product and be recognized as such.

This, i find, is probably what the fundamental problem/friction with teams are.