IIRC in MTW wedge provided a 2x increase in kill rate (both for and against.) So it should confer an advantage to the charge, because the charge bonus will be applied twice as often in the same period of time. Don't know about RTW, but Jeanne d'crc's results seem to bear out this sort of effect.
I admit I rarely use wedge in either game, but it was an "accelerant" in MTW. If you knew the match up was favourable, and you wanted to get the unit onto its next objective quickly, wedge could help.
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