under normal football tournament rules, the reason this doesn't happen is because only zero-sum games go to extra time and anything else simply ends in a draw (

under normal football tournament rules, the reason this doesn't happen is because only zero-sum games go to extra time and anything else simply ends in a draw (i.e. no goal difference change) you are correct that if they simply didn't count extra time goals towards goal difference the problem would also be fixed, but that would feel artificial as counting extra time goals as normal goals is typical in football - for example, extra time goals always count towards aggregate scorelines, whether the previous legs had extra time or not. it is comparing apples to oranges, but that's the expected behaviour, whereas forcibly avoiding draws is equally at fault, but not the expected behaviour in football