Lamine Yamal may not be as likely to fail as Ansu Fati did for Barcelona, but expecting him to replicate the same incredible feats as Messi did for Barcelona is incredibly difficult. Messi has faced players who are as tough as a hurricane. Lamine Yamal hasn't encountered such a player in his Barcelona career. If he were to encounter a player like Ramoz or Pepe in a tough match, he would likely suffer an injury before his career could take off.
It is foolish to compare topical players with Messi and Ronaldo. These two are true legends. They have ruled La Liga for a long time. They have given us the golden opportunity to enjoy all the wonderful matches. I still miss those days. We have seen all the marvelous matches. I still watch the highlights of those matches occasionally.
You are right that if yamal face aggressive defenders like Pepe and Ramos, Yamal may face big problems. It will not be possible for Yamal to score as many goals as Messi. However, Yamal is a promising player. Yamal can be considered as one of the best forwards of the present time. If this young Barcelona player gradually becomes more experienced, we may see 25+ scores every season from Yamal.