I have to disagree with you here. Rules can "support" RP? Yes. But a smart player doesn't need rules in order to be able to roleplay, he can adapt himself to the ruleset (or the lack of one). If you can't roleplay as a princess because some lads are constantly killing you, try something else, roleplay as a noble knight in service of a lord or as a dreaded bandit who wants to see the world burn. It's your choice to adapt or not, but you can't blame the lack of rules if you can't adapt to the new style.