Reminds me of this old thing:
From what I’ve seen in scenario editor, it’s of a very minor benefit to swarmy heavy cav (cossack, raider, etc). It lets them get through light inf just a bit quicker from what I could tell. For huss and especially cossacks its a huge loss for negligible gain.
In theory lifidis and mamelukes can use this to snare more enemies since they combination of low attack and high hp means the effect of recoil damage is minimized. It barely matters at all tho, so there’s actually no practical reason for it in its current form.