I never seen any captains complain about, that a inf class can ride a horse. I actually enjoyed to ride a horse with varyags, or any other non cav class. I also loved to pick up a bow and arrow as a inf player. To have the possibility to use gear dropped or left behind was such a great feature. Tactical, before the update that implemented the nerfing of ALL dropped weapons, you had to be careful. Because, you don't want to leave any stray cav behind for the enemy to use against you, do ya?. And, When the game quite often go into "skirmish phase", picking up a bow as inf, or bardiche as archer, was a strong move, if you have the skill to use it that is.