The decrease of heavy lance damage is an inderect nerf of the arbian warhorse and a buff to other horses.
I no longer 1 hit kill light armoured targets, which I did before. A prepatch 2 thrust kill now takes 3+.
This means horses, no matter what horse, will now receive damage that they didn't recieve prepatch.
I even thrusted a guy, then couched lanced him and finally finished him off with yet another thrust.
Arabian warhorse = useless now compared to before