Teams like Real Madrid or Man City will not show their best performance in pre-season matches, they will only make some changes and this is different from AC Milan who are looking for their best performance with their new coach. However, even so, what has been seen in several pre-season matches, AC Milan's performance deserves to be appreciated, they played quite well and this is an indication that they will be able to do better next season and are ready to compete for the Serie A title.
They don't bother about preseason since their is no price for the preseason and they don't even use their main squad during the preseason they like using the players on bench that's another reason to tell you that they don't care at all, it is not necessary for us to show our best performance in a preseason it is not worth it at all. Especially when the main season is about to start we need to store up all the energies we can store up before the main season starts. Their was a lot of changes especially coaches and AC Milan have be an amazing club and with a new coach now let's see the performance they will put up with their new coach, this season is going to be different, there have been a lot of changes this season. As far it is preseason everyone's performance is supposed to be appreciated, since they are just practicing out after season, and they all did great I won't condemn any club until the main season.
I don't think every others teams are always uses their best squad as you may be thinking. What all teams always do during preseason matches they give chances to other players who are not in the main squad and by doing this, the coaches are just trying to know some players' abilities, maybe if possible, if those new players can be introduced to the main squad. So, as you see, Real Madrid or other strong teams are not using their best squad, which is what others are also doing.One thing I want you to understand is that during preseason, teams always use available players. Not all players are always available in the clubs due to some reasons, like when they play other international competitions and they are not well rested. They always give them time to rest, and that is the reason why some players in Real Madrid are not available on the pitch and even they available I don't think the coach will use the full and same applicable to others clubs.
Preseason is not the best form of teams, but from preseason, we can judge their players. I don't see any reason why a team that will perform well in the main season will performed very poorly throughout their preseason matches. Real Madrid is not performing poorly; they lose some matches and also won some games, and that is how Real Madrid's preseason always looks. As for AC Milan, from their performances I have seen good performances and I may predict that they will surely do well. I can't say that they will win the Serie A league next season, but it is very possible they will be among the top four next season.