It's a legit concern about Arsenal's current form, especially considering their struggles from the previous season. This is about mentality to stay competing at highest level which, I think, Arsenal is lack of it. The competition in the Premier League is too fierce for Arsenal, with teams like Liverpool and Manchester City performing exceptionally well.
Liverpool's strong performance with strong mentality and the return of key players like Kevin De Bruyne and potential additions like Doku and Haaland at Manchester City certainly add to the challenges for Arsenal. The depth and quality in these squads are formidable, and it might seem like an uphill battle for Arsenal to compete consistently with them over the remaining games. Manchester City's ability to go on winning streaks is well-documented, and their capacity to maintain a high level of performance is a significant factor.
Yes Liverpool has developed more of this bouncebackability if I may call it like this. They have been through hard times and they know what is on the line if they play crap. But in my opinion Liverpool is more balanced than Arsenal and they can develop more of the pressing they love to play. It is very intense, but the Klopp team is usually ready to go that extra mile.
They did have their bad days though. Last season was rather a bad season instead of just a few bad days, but they finally have these crazy games when they comeback after falling behind. They still only lost one game so far, which I think was much worse in the last season.