Interestingly in the Champions League there are no teams that can always dominate. Except Real Madrid is only able to maintain three times in a row and of course it will be very difficult to materialize again.
In fact, Real Madrid won the Champions League title 5 times in a row in 1956-1960, more precisely at the beginning of the Champions League being founded, it didn't stop there. Real Madrid won the UCL title again in a row again in 2016-2018, actually compared to any other club. Madrid is the only one who is able to achieve good results in the UCL. If you say they dominate, I admit it because Madrid won the most titles in the UCL.

Source :
https://id.wikipedia.org/wiki/Real_Madrid_C.F.
Yes, I also thought that at that time PSG would be able to win the competition, because the presence of Lionel Messi and several other top players, but again the mystery of the Champions League was difficult to realize. But for next season I also believe that Real Madrid will be able to again defend his title Mbappe will also make a big influence and make the Ancelotti squad stronger. But in any football can happen and no one is able to guess the results of the match in detail.
The presence of Lionel Messi, Neymar and Mbappe is not a guarantee that PSG can win the title, in fact the UCL competition is not as easy as you imagine, it requires a strong mentality and experience.
Actually there was no doubt about Neymar and Messi at that time but football is not just about 3 people contributing, it requires solid cooperation between all the players and also the coach's tactics. If they could fulfill all of that, PSG could have won the title but unfortunately it was too late for all of them already gone
