Villa played many squad players in Europe. We were without a proper DM which is an absolutely crucial position in a Pep team.
I'm not saying that was the best first XI or tactics. For me Pep shouldn't have tinkerer with the defence and try to make room for Stones. If he wanted Stones at DM, play him there and move Fone on the wing instead of Bobb/Savinho. Without Rodri or a mini Rodri like Gonzalez, we suck in CM. So, I wasn't happy with Pep's ideas today, but mistakes happen.
What I'm pointing out are the unrealistic expectations that City should be as good as Arsenal right after the summer. We'll, we can't be ad good as them without Rodri. He's a phenomenal player, one of the best DMs in history. When/if he regains form, we'll compete for the title. It's not too late. Nobody has expected Liverpool to lose 4 consecutive games in the league. Arsenal may draw 4 games in a row at some point, it's far from impossible.