If you make it past the launch, clutches can definitely break transmissions down the track. On the graph above, just look at the size of those wheelspeed spikes after the shifts. Also look at how fast the engine is losing rpm during those spikes. Sudden loss of 2000+ rpm after the shift dumps a lot of inertia on the input shaft, as you can see the clutch on that pass had way too much clamp pressure for efficient shifts. The only reason that it did not blow the tires off during launch? ...look at the slower rate that the engine was getting pulled down during launch vs the shifts. That overkill clutch was being held back during launch by a ClutchTamer.

Quick bit of hillbilly physics- the energy contained in a rotating assy increases exponentially with rpm.
...Lets say a rotating assy spinning at 1000rpm contains 1 unit of inertia.
...Double the rpm to 2000, now it contains 4 units of inertia.
...Spin it up to 7174rpm like the launch on the graph, now it contains 51.46 units. The clutch then pulls the engine down to 4630rpm from 7174, that's 30.03 units of energy getting dumped into the input shaft in 0.589sec.
...After the shift, the engine gets pulled down from 7820rpm to 5132rpm. That's 34.82 units of energy getting dumped into the input shaft in only 0.163sec. Far more concentrated hit on the input shaft.

Launch didn't even spin the tires. The shifts knocked the tires completely loose, most of that 34.82 units of energy released after the 1/2 shift was wasted in instant wheelspin. As you can see, the shifts on the graph put far more hurt on the input shaft than the launch did.

Grant