In my opinion, it looks like Arsenal still doesn't have something important that Man City has, that is the winning mentality. Arsenal might be able to play with confidence, toughness and has high motivation to always get victory but at the end of the season, they actually lost their consistency, where when they lost 0-2 against Aston Villa, though it was a home match for Arsenal. One defeat that ultimately made Arsenal fail to win the Premier League trophy. If Arsenal have a winning mentality, I'm pretty sure Arsenal will have the much-needed composure in that match, so there would be quite a big chance for them to turn things around.
I do not think that winning mentality comes suddenly, I mean sure City may have it because they won so many and that's a great achievement, but they weren't winning when they started, like when Pep took over they weren't as good as they are today, which means that you go from not having it to having it gradually.
I believe that Arsenal may or may not have it, but even if they do not have it then that doesn't mean that they can't get it, they could just try their best and get one title and keep doing that later on. The problem is that when you haven't won a league title for so long, even longer than some of the players' age, then stress and nervous and anxious players make you lose games you should have won, that causes the issue, if they win just even one league, it will become easier.