I wish they would quit trying to restrict the engine power just because one or more other car components come unstuck, or because the drivers don't have the common sense to slow down enough to not wreck or melt the tires. Other racing sports have vehicles that can exceed various capabilities, and they rely on the drivers to slow down a bit. It actually makes winning a measure of driving skill more than luck with tire pressures or chassis adjustment, if the car is capable of going fast enough to destroy itself, and it's up to the driver to keep from wrecking or destroying itself before the finish.
The ONLY time I've heard where the top-tier of a racing league NEEDED to reduce track speeds, was when Indy visited Texas Motor Speedway. They got going so fast at that track that several drivers experienced seizures from the physical stresses on their bodies. I don't know if they ever pinned it on any one thing, but the last I heard they suspected a combination of harmonics from the track surface, G-forces in turns, and a strobe-like effect from the bleachers, fence, and light poles. In any case, after a half dozen drivers had minor seizures during practice, they had to make some changes to slow everything down. That's the one time I've heard where there was a legitimate need to restrict track speeds. Melting the tires or overheating the brakes (or simply entering a corner too fast to make the turn) are marks of rookie drivers, and restricting engine power makes driver skill less of a factor than car setup, pit crew speed, and dumb luck.
