Inter didn't need much fast attacking playstyle to conquer PSG — that's something PSG excels at. What's very frightening about PSG right now is their midfield. PSG midfield made Liverpool's midfielders look like a joke and even Arsenal midfielders (rice + oddegard) were outworked by PSG's?
A better match up would've been PSG vs Barcelona.
They have a strategic way of cunning their opponents into unbearable areas and place players like dembele out of the crowd to build up for a strong clap back. Barca's defense isn't capable enough to fully withstand this kind of attack and they'll always fall prey to PSG's strategy, yet both teams would score.