Inter are still competing with Napoli in the hunt for the Scudetto, but PSG have already secured the Ligue 1 Trophy. This condition makes Inter players have to use all their abilities to win the title race, the risk of injury is very vulnerable at times like this and if that happens it will be very detrimental to them in the UCL final.
It is still difficult to predict who will win the UCL trophy this season because both teams have the same squad quality, but if Inter loses important players due to injury, then PSG has a great chance to win the Treble Winner.
I think it doesn’t matter much right now because the teams have enough time to recover between matches, so the load isn’t that heavy. Besides, I feel it might even be better to stay in good form, like in Inter’s case, where they know they have to win every remaining game this season. On the other hand, PSG can afford to treat their Ligue 1 matches more casually, and sometimes that kind of relaxation can backfire at the most crucial moment.