Nothing is impossible, PSG still has the opportunity to win the Champions League trophy even though they have never won it. Inter Milan is certainly much more experienced than PSG, we know that the Serie A representative also has many other advantages. However, it would be wrong to underestimate PSG. Luis Enrique has a better reputation in the Champions League than Simone Inzaghi, that should also be a difference.
On the other hand, regarding last season final match between Madrid and Dortmund, I think the match was indeed unbalanced, Ancelotti has a much better squad depth than Dortmund, besides Madrid is the king of the Champions League. However, for this season final match, I think the strength of Inter Milan and PSG looks quite balanced.
It is true that in soccer how many times team has won before and how much experience they have can be important. Inter has won big European trophies before which is plus point for them. But you are right we should not think PSG has no chance. In just one final game anything can happen. Luis Enrique their coach has won Champions League before which is big advantage for PSG.
Both teams have played really well and have different good things about them which could make for very interesting game where we do not know who will win. It sounds like it could be very exciting end to Champions League.