If you want a raise, your performance must be high. For the team to support you, you must contribute to the team. Yes, he's a very good player, but he's not yet good enough to single-handedly lead the team to the championship. I don't think he'll have the impact that Mbappe has.
I hope they can reach an agreement on the salary, as it could disrupt team harmony and lower player motivation. These issues are quite risky, and salary discussions can have a negative impact on the team
If we take Vinny as an example two seasons ago, then Mbappe has not even come 10 kilometers close to this level. In fact, Vinnie can also be understood - in Real he has already won everything that could be won (2 Champions Leagues as a peak), he is ready to be top-1 in any team, why should he stay in Real on less than top conditions? This is an insoluble contradiction in my opinion.
Mbappe have taken over all the attention and no one is looking at Vini anymore. They forgot so soon how Vini was the best player in Madrid and was nominated as the favorite for Ballon D'or before Rodri snatched it from him at the dying minute. Vini is still one of the best player in Madrid, his performance declined last season does not mean that he shouldn't demand for an increase in pay when he deserves it.