Compared to a team like Juventus, I think you are right and AC Milan is a good team in the Serie A. They were always in the good form. However, the fact about AC Milan and some other teams in the Serie A is they are still not close to Inter Milan and during the last two years, they were far better than other teams. At the same time, they also hired some players to be better performers than last season which means they aim for the Champions League.
I agree with you. So far I think Inter Milan will still dominate Serie A this season. I see AC Milan and Juventus have made several important player transfers but Inter Milan have not made any significant transfers. Davide Frattesi is Inter's most expensive purchase this season with a value of €29 million. Overall Juventus, AC Milan and AS Roma will be able to perform well this season but I doubt if they will be able to compete with Inter Milan. But I hope Serie A can be more competitive because it seems like it will be boring if only one team dominates the league.
Juventus, Roma and Ac Milan are not happy with the fact that the Inter Milan team became suddenly stronger and formidable as a team last two seasons than were, so there's a need for this teams to strengthen their squad, and for the Inter Milan side, it not necessary that they sign in a number of new into the team when there is no need for that, However, I'm looking forward to seeing a more competitive seria A league this season between Inter Milan side, Juventus, AC Milan, and As Roma way more interesting than how last season were.