If PSG had scored the first goal they would probably be european champions now.
Football is not as simple as that and we can not rely on missed opportunities to say if it happened, PSG would have won the trophy.
However I do agree that in the final match, PSG controlled Bayern's offense system and tactics very well. Despite some personal moments from Lewandowsky and Coman, Bayern did not dominate the game like they used to do in Champions League this tournament. PSG did their works well just lack of correctness in their shots.
Lol. No one really knows the result of the final match even if one of them scored first. There were already many final matches that cannot determine from the first goal. You are too early judging PSG to win if they scored first. The final result is always hard to predict even one team seems to have a better squad. Anyway, It is not a usual match, bro. It is the final match of the Champions League, which team who has a better mentality and motivation, should have a higher chance to win.
PSG with their fast and good dribbling forwards can do well if they score first and take a lead against Bayern. As we see in the final match, Bayern did not have an easy game like their previous matches with Chelsea, Napoli and Barcelona.