Which is why HA/HX are fundamentally detrimental to the gameplay.
Your logic is impeccable.
Instead of trying to educate ground ranged, nerf the people doing nothing wrong.
This is the problem with crpg and the nerfs we have gotten over the years.
The problem isn't horse archers or horse ranged classes, the problem is the ground ranged, or the rambo/ninja's who can't be arsed to keep their own ground archers alive.
I don't see a reason to nerf something in crpg because you can't be arsed to use tactics or teamwork. Don't want to get shot to shit by horse archers? Don't run around by yourself on the edge of the map. Stick with your teammates and you'll be fine.
Or keep running head first into the wall and complain enough to the admins about the wall until they remove it. AMIRITE? No reason to go around the wall, or over the wall or under the wall, the developers will cater to your headstrong ability to QQ on the forums, and take no responsibility for what happens to your character in game.
*FULL DISCLOSURE* I say this as a level 34, 13th generation of cavalry lancer. The main menace to me on the battlefield is horse ranged classes (followed closely by ground ranged). You know how I avoid horse archers? I don't ride by myself 1000 miles from my infantry where the enemy horse archers are roaming.