[Question] What role does upgrades play when we have maxed out the car?

https://preview.redd.it/3707gk9erisg1.png?width=914&format=png&auto=webp&s=8b82deaa5897aa7423ebd585329d28865fd493c3

At this point, does spending money on upgrades make any difference? The races are exciting cause now its just the quality of drivers making the difference, with the championship lead changing every race.

But there is the question of what happens after we max out the car, maybe something like a regulation shift that brings downs the stats, with research we can start doing for next regs like how F1M used to do.