Arsenal is not the only team that will appear with a different face and be stronger by next season. Other teams like Chelsea are doing the same thing. They have changed close to about 99% of their players plus the coach. We expect to see a different face and formation in the Chelsea team.
Next season will be a tough one for every team in the premier league because every team is signing quality players to their team. I don't think Arsenal will be dominant in the premier league as they did last season. They miss their chance to lift the premier league and I don't think they will have such an opportunity again
I don't think Chelsea will be strong enough to contend for the league title and compete with the other top teams, Pochettino will start a process of rebuilding the team to become formidable thus I don't think the squad will be strong next season, meanwhile Arsenal having known their weak areas and points in their squad last season had strengthened their midfield and signed a new defender Timber obviously the team is now solid and will continue from they where they stopped last season, Man City, Liverpool, Man Utd and Tottenham are other clubs that had strengthened their squad too thus makes next season to be one of the toughest season and I am very sure other mid table clubs will also up their game as well.
Why do you believe Chelsea has become power destitute to the point where you doubt their ability to compete with other teams? You haven't provided any reasons to support this claim. If the issue is money, Pochettino has the resources to build a formidable team. Chelsea has generated significant funds through player sales and acquisitions, amounting to approximately $200 million. Moreover, an additional $100 million has been allocated to secure the necessary players to kickstart their Premier League campaign. It's unfortunate that they will not participate in any European competitions, but I'm happy they still possess the strength to remain competitive in the Premier League.
Arsenal had problems with their defensive Midfield and Arteta recognized that by bringing in Havertz from Chelsea, I will love to see more players that will be coming to Arsenal to protect the position they have secured in the Champions League, who knows maybe by December, we would be celebrating Arsenal way among the teams that has the Champions League in their gallery.