You're exaggerating. If, for example, the battlefield in the sixth installment has 10 hexes, then archers will deal, say, 5% or 10% damage. According to your scheme, the need for archers will disappear, and only the AI will use them.
As for the sets, you're right. But it's an incredible bonus if you collect all the artifacts, giving "Lionheart" (I mean the artifacts specifically): +5 to morale and +2 to luck. Then take the horseshoe, and with the Leadership and Luck skills, these characteristics will become ideal! This is only not relevant for necromancers and, to some extent, for mages. Otherwise, the effect is impressive.
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"