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The last time italian club won UCL was more than a decade ago.
WikiLa Liga owns the majority of the UCL trophy because Real Madrid has consistently won it. Real madrid is owning 15 tropohies alone combined with barcelona. It would be different if Madrid were not in La Liga. Madrid has carried la liga to win so many UCL titles. Serie A was not a horrible team, especially since they may still advance to the UCL final. The only main problem if any serie a clubs were qualifying to the final was not able making a proper finishing. It has made club bottled the trophy
The main problem is that they lack a winning mentality. You can see from how intermilan has bottled it last seasons. It can be seen from how Intermilan failed in the 2022/2023 final versus Manchester City. They presently hold 5 UCL places now. It enhances the likelihood that Italian teams will remain in the UCL for an extended period but it must be noted that if it doesn't guarantee italian club to have greater chance in winning UCL. King is back now. Real madrid is ready to break its 3 times UCL winners in a row.
what you say is true, but you forget to understand the reason for this
the Italian championship is very tiring, think Inter lost to Sassuolo twice, a team that went to Serie B
Every game in the Italian championship is difficult and important, you can`t save resources and effort, it could be damaging and counterproductive
so you understand well that it becomes difficult to do demanding things like UCL