Thank you. Your suggestion doesn't say anything of why ponies were chosen instead of larger horse breeds for mounts and charioteering (whatever the proper word might be). It says ponies are swift and strong, but wouldn't larger horses be better at both of these if there were no other conditions in play? Similarly, I can see no isolated reason why ponies would be better at hit-and-run attacks and attacking flanks. If anything, the increased weight of the larger horse would be better for that in "normal" conditions.