Ya, seriously. Are you guys even considering the abuse and exploits these immortal never-get-injuries champions will cause to the game? All you need is champions, doesn't matter if they die, they lose nothing from dying anyway right?
I recommend anyone who thinks the current system is fine, to play a game. In that game, get two champions. Play with the exploit in mind. Go kill monsters to level-up, then kill the enemy factions. And then come back here and tell me it wasn't ridiculously easy.
Don't need units. Don't need magic. Don't need items. Just buy some champions, steamroll every enemy faction and everything they send against you. Who cares if you got killed 10 times over? Your army leader won the battle.
Immortal champions with no injuries = infinite supply of tactical military strength at no cost.