Roman legionaries had quite a good record holding off or aggressively tackling cavalry. What is more important than big sticks is discipline, and that's what they had. The Romans had disciplined, heavily armoured infantry that could stop a cavalry charge - of course with losses but still efficiently - why completely change that if the statisics actually spoke in their favour?
That's a very bold statement...So for me the possibility is that cataphract didnt charge like medieval knights.
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