Torque converter.
Your torque converter also has a sprag inside of it, just like the one in your transmission. A one way locking device. The converters sprag is part of the stator which is the device in between the turbine and impeller inside the converter. The stator is what helps multiply the torque and couple the fluid. When the car sees load during initial acceleration, the sprag inside the converter is “locked” into place, multiplying the torque. As the car continues to accelerate and torque multiplication is no longer needed, the stator begins to free wheel when engine speed increases, coupling the fluid. For the same reason you see broken torque converters when guys have poor burnout procedures, the same applies for a dry hop. When the tires are loaded and unloaded at a rapid rate, the converters sprag goes from free wheeling to locking in place at a very uncontrollable rate. The more you load and unload that converter sprag, the weaker it gets until it breaks. Then the car slows down big time, and you have a junk converter as well as a transmission full of metal. even if you have a mechanical diode in your converter or spragless insert opposed to a conventional sprag, you’re still weakening parts inside what is arguably one of the cars most important pieces in drag racing. And that is just one piece of the car that is taking abuse.
Again if you feel it’s necessary, have at it, I’m just explaining one of the many reasons I do not do it is all.