I agree with you. Juventus performed poorly in the preseason tour. But as you said the new coach will need time to adapt. I won't even be harsh on him for one season because it's not easy to adapt to a team. But at least Thiago Motta didn't really disappoint the fans by getting a bad rating at the end of the season. Their first match is against COMO, a promoted club who is said to have made a lot of good signings in the transfer window this season. We can see how Motta's tactics will play in the first match. I expect a good performance from Juventus because I don't think anyone would have predicted COMO to win that match.
You get a point here, we cannot blame Motta for the results of the pre-season games because he is new to the area and it is difficult to adapt to a new team. But the reason I believe we should hold him responsible for their poor performance in the pre-season games is that this is not his first time managing a team in the Seria A, his previous club was in the Seria A, and he managed Bologna last season, finishing in fifth place, so I do not expect him to struggle to adapt to Juventus because they play in the same league. However, nobody would like to predict that Como will win their next game since they just got promoted to Seria A. Juventus has @1.36 odds on the betting site, while Como has @9.59 odds, showing that Juventus will win their first game of the season.
Inter Milan is still the favorite this season to win the Scudetto,
I don't think Inter Milan will be my favorite team to win the Scudetto next season based on their pre-season performance, however, at this point, I believe AC Milan is a strong team to win the championship next season due to their pre-season performance, as they defeated Manchester City, Real Madrid, and even Barcelona in the penalty shootout.