Perhaps the car's roll and pitch inertial responses during a run can lie outside what the AdvanceTrac calibration expects to see when the steering wheel is pointed straight ahead. Or it could perhaps happen if the LF tire was getting air on the launch and sending a wheel sensor signal that didn't agree with the signals from the other sensors.
Yes, you'd lose the ABS as well. And on the street in a car that's running either stock brake pads or aftermarket pads having comparable friction coefficients you probably shouldn't.
Yes, Ford's ABS calibration is pretty good - for a car with OE brake pads in street driving.
But when you start experimenting with high-mu track pads, understand that the higher mu is likely to lie outside the parameters that the ABS calibration was developed for, and that could bring on inadvertent ABS or AdvanceTrac behavior. Hence the admonishment to leave that trick for the track only.
FWIW, those of us with far more years of driving experience in cars without ABS are probably better at limit braking either to avoid lockup in a non-ABS system or avoid ABS intervention in cars that have ABS. I've been driving for about 57 years, and it's only been the last 20 of which I've owned any car that had ABS (while still keeping at least one non-ABS car for 13 of that last 20). 50 years experience w/o ABS against only 20 with any ABS at all and only 7 where all of our cars had ABS.
Anecdotal to be sure, but I've had the ABS in my '08 go inop at two track days, and the short version is that I was running faster lap times without ABS help than I could with it still active. The non-ABS lap times weren't quite as consistent, but the top two lap times and 3 of the top 4 were w/o ABS on the day that I checked that. I was running mid-level track pads (much stronger bite than OE) at the time.
Norm