It must be admitted that AC Milan journey in the pre-season tour was impressive, but personally I assume that the performance cannot necessarily be repeated in the official match later. The pre-season tour seems easy because there are no targets and pressures, each manager can freely determine the starting XI, without having to worry about the opponents they will face, that's what we understand. We know that AC Milan is able to beat heavyweight teams like Man City, Madrid and Barcelona in the pre-season tour, but if Milan faces these three teams in the Champions League next season, the final result of the match is likely to be the opposite.

The appointment of Paulo Fonseca as Pioli successor has changed AC Milan style of play a little, they look more aggressive, and that's good enough to overcome every challenge next season. The competition for the Scudetto will be more difficult than last season, I predict Inter Milan will no longer be alone in topping the Serie A standings. We are all certainly very curious about AC Milan performance when they have to compete with Inter Milan, Juventus, and Napoli in the top four of the standings. Not to mention if Atalanta, Bologna and Roma appear surprising, they also should not be ignored.
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The matches that took place were only warm up matches here no team gave importance to these matches so they performed as best they could and the most important thing here is that the players tried to keep themselves injury free.  In the case of big teams you may have noticed that every team manager has not played any good players in these matches so that they don't get injured now. If there is a win or a loss before taking the field with such a team, I don't think such a win or loss will have any effect on any team in the main stage match. But I can predict that AC Milan can do well because their performance was a bit offensive and they also paid enough attention to defense in these warm-up matches. 

The main thing is that first a new season will start, each team will play a few matches and then predict how any team can do in the next season.