The case for Arsenal at this time, besides benefiting from playing at home, they also greatly benefited from seeing PSG's current focus, especially in domestic competitions they are not in good condition so that indeed this could be a whip of more enthusiasm for Arsenal,
And Arsenal draws with Crystal Palace and Brentford are anything to brag about?
PSG has won the Ligue since April 5th, there is no point in them even playing with the first team in the remaining matches, it makes no sense to stretch your team over something you have no benefit from.
Even if it can't be too proud but at least they avoided a match without losing, it should be taken into consideration because after all in this case defeat can be one of the triggers for the mentality to become worse.
PSG do have a winning streak in the domestic league but their stats but can it be compared between Ligue 1 and the EPL? And besides that we can look at their last 5 matches in all competitions in the end you also have to accept that PSG lost 2 times to Aston Villa in the Champions League second leg as well as last week when they were beaten 1-3 by Nice at the Parc des Princes.
Not that I'm favoring Arsenal and imposing my will but we know statistics although not always a benchmark in 90 minutes of the match but it can be an important part as a consideration of strength.