Mbappe was given too many privileges in PSG, and that is what has affected his attitude. At any time he wishes to leave, they are always quick to seek for a way to make him stay. He knows how important he is to PSG as they have shown, that is why sometimes his attitude even towards the manager of the club may be disrespectful. PSG should him go, the manager they have is not strong enough to control him. If it was Erik Ten Hag or Pep Guardiola or even Mourinho, coaches who have a successful career and do not want any payer to ruin it, they will be able to control him.
Mbappe is a young fantastic player, and I think any club that owns him will be very proud of him. They won't be happy to see a young great player leave their team, either, because it's really uncommon to find a young player with his level of skill on the market right now. I think PSG understands the worth of mbappe in the team, which is why they treated him with such respect. I might even argue he deserves it because he has been giving it his all for PSG, which has greatly aided the club's success.
Arsenal really shouldn't be underestimated next season, especially in the Champions League because Arsenal themselves are also very aware that they still have to improve on existing deficiencies to be able to wade through an even greater next season. And not only in the Champions League, Arsenal must be taken into account, but also in the Premier League must also be considered from the start of the season, because Arsenal will try to be consistent from the start of the season to fight for the title next season.
If I have to say that I don't think anybody will underestimate Arsenal in the next Champions League with the performance the club showed last season and the way Arteta has built the team by bringing quality players to the team, I believe that should be enough evidence for anyone that Arsenal will perform well. With this Arsenal squad, I am expecting them to be a great team next season with many achievements. Arteta is a great coach, and I believe that he has learned from his mistakes last season, which is why he is trying his best to bring in strong and determined players, not just players by their names.