For those that _still_ haven't gotten it - it's not about balancing cav vs other classes, it's about balancing cav vs cav, skill wise - giving cavalry players a similar learning curve as, for example infantry. Giving cavalry fine nuances that players can use to their advantage and shine out when compared to other, less skillful/experienced players. Giving cav techniques to use that are hard, if not impossible to master.
It's not about cav being OP or UP.
I have no doubt this will once again just be ignored anyway.
Well, you wrote in your opening post
what changes could be done to increase the player skill needed to ride a horse? Right now, it's W to accelerate, S to decelerate. Therefore, it's more like a motorbike than a horse. Maybe someone who has done real riding has some insight how we could translate rider skill into a game mechanic? Riding should be difficulty in itself, just as flying a plane in a game would be. Riding needs more nuances.
which can also be summed up as "playing cav needs to be more difficult -> cav nerf". This is why people (and me included) unwittingly also referred to OP or UP.
But if you want something to increase skill: how about limiting the stab like the couch? You are able to chamber your stab only for some time, then the dot gets red and you need to wait. A quick series of blocking and chambering will be possible, but only for a few seconds, then you need to recover.
And make the "time damage curve" of the stab more extreme. Which means there is a tiny time window after chambering the stab where the damage is the highest. Everything before and after this time window lowers the damage drastically.
I don't know if thos changes can be apllied for the other classes like 1hd (same limitation) and Xbow (aiming), but you could think about it. It doesn't work for HAs, because they are limited in time with the bow mechanic anyway. Stopping the constant draw-cancel-draw-cancel behaviour would be nice, but it would actually come close to a stamina mechanic, so that I wouldn't do it.
Edit: but increase the stab angle again.