[TSM330i]

I don't think 50:50 weight distribution is the end-all be-all in any way shape or form.
Right now, three of the fastest cars around a track (C&D Lightning Lap) all have a different drivetrain layout.
Quickest is rear engine: GT2RS
Second is front engine: ZR1
Third is mid-engine: 720S

I believe chevy saw the light in racing. The Ford GT, Ferrari 488GTLM and the 911RSR are all essentially mid-engine cars.

The above noted 720S is the "standard" car, not the LT version, which will more than likely be quicker than the GT2RS when it comes out.

We have to remember, once you turn, put the brakes on or accelerate the car is no longer 50:50 weight distribution. It's shifting and how the chassis deals with the shift in balance will determine how well it performs.