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Madrid didn't win by a big margin. It's also true that Madrid's attacks were a bit weak. But this was Xabi Alonso's first match in La Liga. He needs time to adapt to the new environment. Alonso is still not completely aware of the way La Liga rival's gameplay . Gradually, he will correct his mistakes. And Madrid's performance will also become stronger. The new manager should be given enough time.
What I like about Real Madrid's narrow victory over Osasuna is the courage of the midfielders in taking shots at Osasuna's goal.
Regarding the attack line that you consider weak in that match, in my opinion, the three of them—Vini, Mbappe, and Brahim—faced difficulties because they are not natural number nine players.
Alonso should have a number nine player after the last one was filled by Benzema and Joselu. After Joselu, there has been no number nine player in the Real Madrid squad.
Tactically, that's important. Barcelona, for example, has Lewandowski, and that has a significant impact on their attack.