The only character who benefits from "Enemies at equal level or below" is Sibille because her orb is always her level. No character struggles with enemies of lower lvl, so that's pointless on any character. Even Margie handles things lower lvl than her just fine. Other characters won't slot those wedges in, but Sibille players are required to sacrifice wedge slots to make up for the characters base skill scaling being unbalanced and too low.