Yamal made an impact on the game as soon as he came on. Barca needed him. Lewa and Pedri also played very well.
Matches between Barcelona and Real Sociedad have always been enjoyable. This one was no different, especially in the second half. The true owner of the top spot has taken over. Barcelona is the favorite for La Liga this season as well. Seeing the problems at Real Madrid, this year's title looks like it will be easier than last year's.
You're right, Lamine Yamal was absolutely essential in Barcelona's attack. He came off the bench and was responsible for Barcelona's effective attack, leading to the second goal. There were several big chances that should have been converted into goals, but unfortunately, they weren't. Barcelona is truly fortunate to have Yamal in their squad and he's one of those players who can truly impact the game.
Honestly, I'd say Roony Bardghji and Dro Fernández deserved to be benched instead of given more opportunities in the lineup. Hansi Flick shouldn't have been so confident in trying to rotate so many players at once in a crucial match like today, but he was incredibly fortunate to secure the win and move top of the table today.