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Also a rallycross engine didn't have to survive long - 3 heats and a final - what's that in mileage? 20? 25? A rally engine had to last for a lot longer (especially as the rallies were longer and more spread out).
Group B had excess power - there was more than the cars could usefully use due to limitations in tyres, suspension, drivetrains etc etc. Modern cars have excess grip - the cars run like they're on rails as there isn't enough power to cause the other components to run beyond their limits. The answer is more power or restrictions in the other areas (less grippy tyres, worse shocks, limits on what diffs can do, limits on electronic wizardry etc)
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