I always find it curious how F1 fans always want to point to a single hero if the car is good, and a single villain if the car is bad, as if someone in any F1 team had dictatorial power to decide every aspect of the car and the other engineers just had to silently accept their orders.
I always see this phenomenon with Adrian Newey. Many people see him as a "magician" who, by simply hiring him, will give the team a championship-winning car, as if Newey designed every single screw of the car alone. The truth is that Newey had, throughout his career, a competent team of engineers who had the skills to apply his bold concepts to the car. Basically, Newey gives a direction, a concept, and the engineers from the various departments need to have the technical competence to transform that concept into reality.
Just hiring Newey and keeping the same incompetent engineers responsible for previous failures is not enough for a team to be champion in F1. In 2026, the most likely outcome is that Red Bull, without Newey but still retaining a good portion of its excellent technical staff, will have a strong car to fight for the championship, depending on the engine. Meanwhile, Aston Martin, with Newey in charge, will remain a midfield team, as the changes at AM won't necessarily translate into a championship-contender car in the first year already.
The concept for Ferrari's 2025 car was already decided before Serra arrived. Serra had no involvement in that and simply had to work with what the technical staff had already decided. The SF-25 wasn't a direct result of Serra's work.

