Goals change the course of games, and when the first two goals are dubious, it's going to affect how the rest of the match plays out. If Leipzig could've kept a clean sheet until the break and Ederson had been shown the red card, who knows what might have happened.
Let me make this clear: City are a WAY better team. They are going to win this fixture 99 out 100 times, especially at the Etihad. But they shouldn't have received those favors from the referee. Leipzig were denied any real shot at this game because of him.
We saw how Milan and Inter went through by digging in and playing ultra defensively (albeit against worse teams). Had a similar referee been in charge of their games, they wouldn't have had a chance.
Such refereeing performances bring the game into a state of disrepute. I don't think it's in City's best interest to win like this either.
In short: Congrats on your advancement. Massive performance. But I don't want to hear you guys ever complain about refs again.