One of the early appeals of Rolemaster was it’s “realism”, and while most people thought of the combat system there was also exhaustive material around magical herbs. In many ways, RM herbs supplanted traditional fantasy RPGs reliance on healing magic and healing potions. Some even argue that RM healing spells are relatively weak, or that the detailed injury system required too many spells to heal even minor wounds.
I think many players/groups use herbs in different ways: some to augment natural healing processes while others allow for instant, miraculous healing effects. “Chew and screw” so to speak. Instant effects allow groups without skilled healers to adventure, or groups in intensive dungeon environments to maintain their tempo.