It’s pretty realistic though. Ok, 7 seconds is a lot, but in real F1 there are huge differences on tracks like Monza, because some cars are tuned for straight line speed and others for cornering. It’s hard to achieve both when designing a racing car, because they sort of oppose each other.
I don’t think Italy is the only track where McLaren has a clear advantage. Germany and Canada come to mind, they’re also both high-speed circuits just like Italy.
To win the championship, you don’t have to win each race. You don’t even have to win a single race 🙂