Totally agree, OP. This is a core characteristic of a good role-playing game and it completely baffles me why Larian has chosen to do things the way they are right now. If anything role-playing your way out of a situation, including combat encounters, should give you more XP. But I will gladly settle for roughly equal XP. No XP is just ridiculous, and does not reflect how D&D works. And halfway-decent DM would absolutely give you plenty of XP for innovative role-playing, including persuading, intimidating, or talking your way out of situations.
