Why is Barcelona so strong that it can't even defend the Champions League? Did UEFA do it?

In fact, now I feel that Barcelona's lineup is still flawed, relying too much on Messi's goal. Harvey, after all, is a midfielder and lacks stable goals. Just like in the basketball game, there is the first scorer, but no matter how well organized others are, there is no stable second scoring point, so it is difficult to win the game without the feeling of the first scorer. Last season, there was Eto 'o at first, then Ibrahimovic (although he didn't get along well with Barcelona, but his personal ability and scoring rate were unknown), and then Villa. But what happened after Villa was injured? Really, no one can provide a valid scoring point. There is also the so-called Messi dependence in the game. I am not a Barcelona fan, but a Real Madrid fan. At this point, Real Madrid is much better now. Cristiano Ronaldo will not enter, but Benzema and Higuain will basically stand up. This is also the reason why Real Madrid can score so many goals this year. 34 league matches 109 goal. I wonder if it will reach 120 in the end.