Hussar
Legend
@nd edition in particular rewarded roleplaying with its XP awards. Each class (role) got bonus xp for actions related to the class (role-playing). 3rd edition has made it easier than ever to support role-playing: it is no longer a matter of whether you kill everything in the room, because XP is gained from overcoming challenges, no matter what they are or how it is done. That definitely facilitates role-playing.
The only bonus xp a fighter got in 2nd edition was for killing stuff. Wizards got bonus xp for casting spells (yeah, that was a hard bonus to get

Even playing entirely in the third person, at no time in the game has a PC been rewarded by the mechanics for talking to an NPC. My cleric could rise to become the grand high mucketymuck of his church, but, from a mechanics point of view, I would receive nothing.