Dropping it will torque just about every undercarrage & suspinsion part very hard and very suddenly. Sudden, sharp and very strong forces are much more damaging than a very strong force spread out over a little more time.
It's the difference between getting hit by a bullet traveling a thousand feet per second and one traveling 10 feet per second. One hurts, one kills you.
You'd much rather have a worn out clutch than torn up gears.
Clutch replacement is much easier compaired to fixing a gear.
If you tear up a gear, you gotta find out which one you tore up... your diff gears, or some in your tranny... Or both. Then, you have to disassemble the entire unit, replace the F'ed up gear, and examine the rest of it to see if any other gears have been damaged by floating metal shavings or chunks. Lots of labor.
Or, if your just trying to slide around, start normally or kinda hard, get some momentum, say 20-40 mph (once your in the torque band), and jerk the wheel to one side and then back to create a large weight shift, and stomp the gas. Wala, not so stressful on the driveline and the rest of the car.
Doughnuts arn't as bad, stright out burnouts while you are holding the breaks not only can tear up the gears (if you dropped it), but it will WEAR OUT your rear breakpads and rotors, and if the heat gets really high (which it will, really fast) you can boil the brake fluid and then you got air in the lines and your brakes will be all messed up until you bleed them.