these matches happen you are not always lucky every Sunday it is difficult to always have control of the situation even when you play well and many times you have to have a lot of luck regarding Inter I would say that Atalanta were below their average performances therefore the victory of Inter was easy while Juventus faced a great Roma team who gave them a hard time
Atalanta was not a weak opponent. However, Inter Milan players managed to perform very well against Atalanta. And Inter Milan won by a big margin of 4-0. The performance of the Inter Milan players was really very organized. So beating the Atalanta team was not a difficult task for Milan.
On the other hand, since Juventus managed to perform well in the first two matches, we also expected Juventus to continue their winning streak against Roma. But Juventus' performance against Roma was poor. I don't see a chance to say that Roma team was a strong opponent either. In those matches, Roma drew two and lost one. In this season, the Roma team has not yet won any match. So this group cannot be called strong. Juventus cannot play well in a home match against such a team. If Juventus want to win the title then the winning streak must continue. There is no alternative. If the performance is irregular, winning the Serie A title will not be possible for Juventus.