Despite the fact that he is kind of a troll, The point stands.
Gaining XP in this game is so fast that there is no need for an XP bonus like this regardless of how often you play. The only thing in this game that needs Bonus XP is Crafting and this would be nothing more than a band-aid fix for that.
Rested XP is a gimmick, and it is far from necessary in a game where the most casual of players can hit level cap after less than 50 hours of game play. 50 hours of gameplay is less than the average single player RPG ten years ago..