Maybe because there has been a very deep decline in Napoli's performance this season so that the AC Milan vs Napoli match is not really considered a big match unlike last season's meeting, especially since their mainstay striker will still not play in this match so their chances of getting at least one point are very small because it was proven that without Osimhen Napoli would have quite a hard time scoring goals.
In the last few matches, Milan has been a quite productive team by scoring at least two goals or more in every match, so Napoli, whose defense is quite weak this season, will probably concede a goal, but if Napoli can overcome their current problem in scoring goals then they also have a chance to broke into Milan's goal because their opponent was not strong enough in defense.
In the last four meetings, Napoli has not managed to beat Milan, their best result is only holding a draw so Milan's chances are very big.
Napoli has indeed experienced a significant decline in performance this season. Because when compared to last season, the difference is very big. The reason is that last season Napoli managed to win Serie A perfectly by only losing 4 times in all matches. However, this season Napoli have not been able to maintain their performance and up to this week Napoli have suffered 7 defeats.
So it is natural that AC Milan's match against Napoli this time is not called a big match. Because, it's all because the performance of Napoli and AC Milan this season is quite different.
The team coached by Stefano Pioli (AC Milan) this season has always been consistent in every match. The reason is, currently AC Milan has managed to rank 3rd in the Serie A standings with 49 points and has only lost 4 times. So the achievements achieved by AC Milan this season are quite good and almost the same as last season. The reason is that last season, AC Milan managed to finish in 4th place in Serie A. So in these two seasons AC Milan can be said to have had quite consistent performance. Maybe AC Milan only needs 2 or 3 new players who can complement/sharpen the defensive line and attack line. If that's the case, I think AC Milan will be able to compete for the Scudetto.
So the conclusion is that in this match (AC Milan VS Napoli), AC Milan is superior in all aspects and factors compared to Napoli. So the point is that currently Napoli cannot be compared with AC Milan in terms of the quality and performance of their players.