That's right, the two cannot be equated. La Liga is much more competitive with a very fierce competition compared to the Bundesliga which Bayern Munich has dominated for the last 10 seasons.
Losing Messi from Barcelona is a natural thing. I think, the team needs regeneration because Messi is getting old and the players also need other adventurers for his career. it won't matter much when Messi and Ronaldo leave La Liga, La Liga is still a fierce competition.
It's true what you said, if indeed La Liga is a little more competitive than the Bundesliga and Ligue 1, because there are several teams that do compete in the championship competition, unlike the case with one or two dominant teams such as the Bundesliga and Ligue 1, but I think lost Messi and Ronaldo actually lowered the prestige of La Liga, especially in matches like el classico , although we still see an El Classico duel but believe it or not, El Cllassico is no longer as hot as it was when there was still competition between Messi and Ronaldo.
It's true, El Clásico matches seem to be a normal match now because there are no more main actors, but also considering that over time El Clásico will be hot again but I'm not sure it will happen anytime soon. Because right now all eyes will probably be on the EPL, there are great teams, great coaches and great players. The reason I say it took a long time for the El Clásico match to return to high tension, is because Barcelona themselves are still in the stage of improvement and also, the current star players they prefer are teams in other leagues and not with La Liga.