Anyone knows why Barcelona has a packed schedule this early in the season? A game on 24th, a game on 27th and a game on 31st? Seems like too packed for start of the season, is there a logical reason for that? In any case, they should be good enough to beat any opponent they face at this level, they are not really that bad and they should realize it by now.
In fact, Vallecano looks like it would be a different division team against Barcelona. That doesn't straight up mean Barcelona will win, we have seen top division teams to lose to other division teams on cup games before, not unheard of, just that it means the gap is too huge and it would be humiliating if Barcelona doesn't just destroy them, which they should be able to do.
Real Madrid are also in the same situation, for example Real Madrid played on the 25th of this month against Real Valladolid, then they will play on the 29th of this month against Las Palmas, then they will play again on September 1st against Betis.
I believe that the reason for playing so many games is because there will be a 14-day break for the Nations League games. I honestly don't like these Nations League games, but on September 6th the French national team will play against the Italian national team, it will be a very interesting game if all the best players from both teams play. Going back to La Liga, Barcelona won the game, it was clear that with the entry of Dani Olmo, Barcelona started to play very well.

In the final minutes, Barcelona could have conceded a second goal. I think that Barcelona, with the arrival of Dani Olmo, will play very well in attack. But they need to become stronger in defense, they have conceded a lot of goals. In 3 games, Barcelona have conceded goals in all 3 games. This is not a good thing if they want to be La Liga champions.