Why aren’t car ratings based on actual lap times?

Noob here and I’m wondering why two A700 cars can have so much difference in lap times?

I get tuning. But why doesn’t tuning increase the car’s score as the car gets faster lap times?

The game seems to reward players who like to tune more than players who like to drive. It seems like this would be the obvious way to solve the meta car problem and reward good drivers as well as good tuners.