^agree'd
The problem is becoming reliant with forza aero.
When transitioning to not using aero it usually leaves you dumbfounded as you can no longer take the same lines and your tuning bias is turned upside down.
Lets just say if you build and tune a fast car with aero then remove the aero, the car is typically trash.
It's vice versa when you add forza aero to a generally fast car/tune with no aero, in fact the car should be golden and will surpass the car tuned with aero from the start.
IMHO it's way easier learning it once than having to learn everything over again.