Unfortunately, Italian teams have not raised the Champions League since 2010, but it must also be said that in the following years there was a chance to win several times with Juventus and Inter last year. Unfortunately they didn't manage to raise it, but I believe that in the years to come and with all these new owners of the top Italian clubs, Inter Juventus and Milan will have further chances to win the Champions League. At least I hope so
Italian teams are not weak. However, they are not interested in spending a lot of money on squad formation. So even though the performance of Italian teams is stable, none of the Italian teams have a squad strong enough to win the Champions League title.
~Snip
It is true that in the last decade, not a single team from Serie A has been able to win the Champions League. However, the only teams that dominate and always win the Champions League come from La Liga and the Bundesliga. However, in my personal opinion, Serie A teams are not weak, because in this decade Juventus managed to advance to the Champions League final twice in the 2014-2015 season and also in the 2016-2017 season. Apart from that, in the Champions League last season, the team from Serie A, namely Inter Milan, also managed to advance to the final. Although in the end no one succeeded in becoming champions in the Champions League.
However, this is enough to prove that teams from Serie A are no less competitive than teams in other leagues in Europe.
Apart from that, if you look further into history from 2000-2010, it is actually very rare for teams from Serie A to win trophies in the Champions League. Only AC Milan has been able to win the Champions League in several editions. So it could be that the reason why Serie A teams do not perform optimally when competing in international competitions may be because club management is reluctant to spend a lot of money. However, the management at Serie A clubs only form teams with not too much capital, but are still able to compete quite well. But even so, I am quite impressed with the teams in Serie A, because even though they don't spend a lot of money, their team can still be a team that is still respected in Europe. And for next season, my prediction is that the teams in Serie A will remain quite tough competitors in the Champions League. But to become champion, it might be a little impossible. Considering that big clubs like Real Madrid and Manchester City are getting stronger now.