I agree with you. In football, playing well alone does not guarantee victory. Even if the performance is good, there is a possibility of defeat. We have seen many matches where the team lost after performing well. However, given Napoli's current position in Serie A, a poor performance in a few matches will see them win the title. Napoli has no reason to worry about the Serie A title. Now Napoli will try to qualify for the Champions League final. And I don't think it will be difficult for Napoli to qualify for the Champions League final either. Because the players are very confident now.
Napoli don't worry that result of the match with AC Milan will be harmful for their chance in Serie A but if they get bad result from it, they will not have good preparation for two more important matches with AC Milan in Champions League.
Hence Napoli will try to aim at a draw at least in Serie A with AC Milan and a more important task, avoiding injuries on their most important players like Osimhen and Kravatskhelia. Those players are important for Napoli chance in Champions League firstly for two matches against AC Milan and in future for semi final and final matches if they can go far.
Napoli's brilliant performance in Serie A this season has received a lot of appreciation. How could it not be, the dominance shown by the team from Naples is clearly visible from the standings and points earned. Napoli's success is also clearly illustrated by Spalleti's genius in concocting tactics and then team togetherness is the key to cohesiveness which results in good performance. So teams that play collectively are very difficult to stop because they don't rely on individuals at all.
The success of Napoli in this season comes from many factors, from their coach Spalleti to their great successful transfers in the past two seasons. Spalleti after a few failed seasons with AS Roma against Juventus and Inter Milan years ago actually got great lessons for himself.
Their transfers to players like Kravatskhelia, Kim Min Jae are surprisingly successful and without those people, together with a strong return of Osimhen after his injury in the past season, Napoli would have not gotten very successful performance so far.