If you look at Arsenal's squad, there are very few star players compared to Manchester City or Liverpool. But even then, this team is able to perform brilliantly. The bonding between the players is very strong and Arsenal's match strategy is also good. This is why Arsenal has been able to retain the second place in the table for the last three seasons.
The problem with Arsenal's squad is that although their starting XI is strong, their bench team is not as good as expected. So whenever any important player in the squad gets injured, we see irregular performance from Arsenal. This is the only weakness of Arsenal that we have been seeing for the last 3 seasons. If Arsenal's coach can solve this problem, Arsenal has the ability to dominate the Premier League.
Yes, that is a problem in the reserve players that Arsenal will soon overcome, and fixing when the core players cannot play optimally or are injured, of course reserve players are needed in this case. There is a need for improvement in the squad to compete consistently in all matches that will be faced, especially in the Premier League, however, coach Arteta will improve his team with reserve players who can approach the core players and Arteta has thought about it to be more advanced in the future.