Totally agree. I just don't buy the argument that Track Mode is withheld from this model or that model strictly because of the hardware differences. As a software engineer, I don't believe they would have build Track Mode to be so brittle as to rely on rigid hardware specifications. As long as the sensors are there and the two motors for the balancing, I believe that all three versions of the two motor Model 3 (AWD, P3D-/+) are compatible.
Good thing you're not a mechanical engineer then. The brakes and track mode work as a whole system, it might "technically" work with different hardware, but that's not how it was engineered. It has nothing to do with being brittle. Changing one variable in a system can have unintended consequences.