The points of the two teams in the Champions League group match are the same. Why use the winning-losing relationship between the two teams instead of the original goal difference?

When the points of the two teams are the same, if we compare the goal difference first, we will pay more attention to the strength of the relevant teams in the whole league; If we compare the winning and losing relationship first, we can only explain the strength comparison between the relevant teams. Because the probability of a football match is quite large, if the two teams have the same score, if the relationship between the two teams is considered first, the staged game may end just because of one or two games. Generally, the winning-losing relationship is calculated according to the winning-losing relationship, which can well reflect the situation of these two teams. What's more, the Champions League is not any other regular league. What the Champions League wants is not the crazy goals of the two teams, but the contest of the strength level of the two teams. Too many goal difference is not enough to explain the true portrayal of the strength between teams. Moreover, for the Champions League, the emphasis is on viewing, and only crazy goals are not enough to prove the fierceness of the game. Therefore, it is meaningful to change the Champions League to see the relationship between the two sides when the points are the same, and then compare the goal difference.