There were two sets of bugs: * the new sort handled ties differently. They adjusted that, and they could have stopped there. * the other was that the correct

There were two sets of bugs: * the new sort handled ties differently. They adjusted that, and they could have stopped there. * the other was that the correct drivers were sensitive to loading order. They handled this and another driver bug, amdtemp. This was masked by the old sort. If they'd found this years later, even investigating the first set would be a slower process - it wouldn't be fresh in minds, and it likely would then have other code relying on it, so adjusting it would be trickier.