Barcelona have been looking for Messi a lot on the field this year. When big stars fall, they create big gaps. They couldn't make up for Messi's absence. If they don't create a big star, they will lose the league to Real Madrid again. Real Madrid have the advantage of dominating the league more than ever. They seize this opportunity well. The Spanish league will be similar to the German league.
You could say the same thing about Real Madrid as you did about Barcelona... They lost Cristiano Ronaldo but didn't play worse and won La Liga again... Maybe it's the coach, not the missing star... Barcelona still have good players.... By the way Messi also didn't play very well at PSG this year it seemed to me...
The role of the coach is very influential on the club's success, after Cristiano Ranaldo left, Real Madrid's appearance is still consistent. Real Madrid have proven it, the success of the club is very influential on the tactics used by the coach. Barcelona is very dependent on Messi, without the presence of Messi Barcelona is like losing power on the field. The development of Barcelona has begun to be seen in Xavi's hands, slowly the Camp Nou public has forgotten Messi, Xavi must make Barcelona return to a high level even without the presence of Messi.