On an historical note: that was pretty similar to what happened in a cavalry wedge formation. The leader made contact and surged into the enemy formation. While more and more horsemen were fed into the gap.
On a mechanic note: what you call multiple charges, are actually less effective than say three charges from three sides (flank, rear bonus etc). So in a manner of speaking your opponent is sacrificing effectiveness (inflicting less damage) for a quick execution.
On an engine note: it is the RTW engine that forces units to converge on the center of a formation. Thus incapacitating the charger to attack on the even front that he desired. The solution would be to attack different targets, while perfectly possible, it forces the attacker to "take more time" and also it prevents him to focus his offensive on a key portion of the enemy formation, which would tactically serve his purposes best.
On a personal note: let the vox populi decide whatever it wants. It will not make this any more accurate, the impossibility to focus a cavalry offensive is a biased solution by an infantry perspective. I could make the same case for blobs of infantry concentrated on a part of the opponent formation. With an equal case of physical impossibility for thousands crowded, not mentioning the deaths by trampling and asphyxiation that would occur in reality. Or the impossibility to wield weapons!
Still we are social beings and as such I will abide by whatever "law" we set. But as far as I'm concerned this is a non-issue, related to a broken feature, occurring with both cavalry and infantry. By the proposed reasoning EBO will turn in champion confrontations of one unit frontally engaging another, while the rest watches.
Others might instead use less cavalry and zig-zag the 1-2 they have, making it impossible to catch (another engine's broken feature, for even fast moving units will not catch up to exhausted armoured horses) and claim they aren't doing anything inaccurate/unfair. People will order their infantry to execute mid-melee cessation of hostilities and falling back, something borderline impossible in ancient warfare, achieved only by the most drilled veterans and even then with difficulties and fails. Other currently legal moves, have infantry rushing across the battlefield, skirting the enemy, turning, facing one side, do whatever shenanigan that only an aerial viewpoint can permit, not withstanding both the pratical impossibility in reality and the physical impossibility for those men to do anything of the sort: this is RTW engine, there will never be 'historical accuracy', except the aforementioned single engagement. In my opinion people just shouldn't forget they are playing a videogame and remember the words of Heath Ledger's Joker...
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