Actually both Sage and Guide have very strong impulses. Guide wants to help bring out someone's full potential while it seems like Sage wants to min-max and using people to their full potential. Gideon's blessing perfectly complimented his personality and desires, so perfectly that his blessing never needed to "correct" him via impulses. Ares is a fucking idiot so his blessing which basically requires you to be observant and pragmatic turned him into a power-tripping egoist. The problem has always been blessings going to people who simply are not suited to them and potentially actively working against their desires
Unless the LN changed it the Guide's role isn't that generalized. The purpose of the Guide blessing is to watch over and train the Hero - specifically - until they're strong enough to stand on their own. It gives you 30 bonus levels and nothing else.
It usually goes to somebody close to the Hero so the corrective impulse is already aligned with what they want to do, and unlike other blessings it pretty much leaves you alone outside of that. At the start of the story Ruti is already past that point, so Giddeon no longer gets any sort of impulse from his blessing.
... The guide often dies pretty soon after the Hero is strong enough, too. The WN side story series is about Ruti in the world where Giddeon got Hero's Journey-d.