Crits solve the problem of when a trooper is able to sufficiently stack ARM so high that at all succeeding at wounding is far too unlikely or outright impossible, or when MODs have been stacked so high that winning a Face to Face is far too unlikely, which isn't what the game is meant to be about. Solve tthe situation with the soldier with effective BS of 2 faces off against an enemy with an effective BS of 13 and you can probably shift crits to no longer auto-winning. Solve the situation where a Trooper (TAG really) in cover can reach 12+ ARM versus most weapons' DAM 13 Normal damage and you can probably shift crits to no longer auto-wound. Want to add skills or equipment that increase ARM? Want to make heavy armour generally have higher and more impactful ARM levels? Better keep crits. Or increase damage values, but that makes the game deadlier to soldiers and civilians without any functional armour. But maybe that's something positive?