Statecraft is designed aroud tall for a reason. Wide is quite capable of playing diplomacy, so that tree let tall players be in the league, and for wide players it offers an easier diplomacy game, it's not the same to be friends than to be allies. CrazyG point is fair, though. Starter is relying on something too random.
I've felt a bit disappointed when playing thick (not tradition) and taken artistry. Other than the scaler, policies aren't doing anything useful for a long time. I whish some of those policies allowed a thick civ to work some more specialists, specially in secondary cities. You don't work many specialists because happiness is quite limited. You don't get happiness because you didn't work many specialists. Fealty has a policy making specialists give some faith and gold. Maybe not the same thing, to avoid repeating, maybe +1 happiness for every GWAM specialist. That way, even the widest civ will want and be able to work all of their cultural specialists, not only build the guilds. Not that useful for tall, but tall is already good at the cultural game.
I like that Artistry is related to great people and great works, but it needs to let wide civs to join the cultural game. Any ideas?