[Piotrsko]

Traditionally, in a powerglide used for racing, no TC, the bands tend to wear out faster, particularly the low one used to get the car moving.

Notice the caveats.
The secondary and any other bands of a multi-speed modern trans probably wont see that much additional wear because the ring set is dealing with a moving car. In a powerglide, the low band is gone before anything else so that's the rebuild point.

OTOH, the majors unlock the TC between shifts for a reason, albeit for comfort and smoother shifts.

Worse case get an analysis on the fluid looking for band residue.