Imo, it was more a result of both teams being more cautious and worried of the opponent's firepower. It was more of a stale game imo, than a match of insane pressing from the two teams. Maybe the no fans atmosphere gave that impression but that's what it seemed to me.
I mean "cautious" would mean that they'd rather slow the game down and do not try anything fancy, but I don't see that that was the case.
You saw on both sides Davies and Kehrer getting constantly flooded by opponents and forced to errors. It was a destructive game, meaning that end-to-end stuff wasn't happening because it took like 5 minutes and either Thiago or Herrera until the ball even went onto the other half of the pitch. But that wasn't part of anyones gameplan or cautiousness, it was just very difficult to play it out of the back. Actually PSG pressed even a bit more than Bayern in the first half, but Bayern kept the intensity up for 90mins whereas PSG really dropped off.
Anyway, you can also see it in the games vs Atletico, Barca, Chelsea or Tottenham. British pundits have been banging on about "abusing the highline" for months as if noone ever had the idea. But Liverpool plays a highline aswell and dominates that league.It's as much of a weakness, as it is a strength in this current pressing META and these longball statements are basically "ideal fantasies" that seem so obvious and seemingly easy to exploit, yet realistically the teams end up running into a trap 95% of the time when they attempt that.
It sounds so easy and obvious in theory and when we talk about it in online posts. "They stand so high. Just lob the defense". But its not like managers are idiots who don't think of that type of stuff for whatever reason. It simply isn't as easily applicable in real life scenarios, as it is in grey theory in a SkySports Studio debate.