This would be true if Square Enix didn't design everyone to be able to heal and defend themselves. With your heal, shield, and potion making you a semi healer regardless of Job, role, range or melee you don't need your team if its a 1v1. In a 1v1 situation melee will dominate around pillars compared to range. Plus we're forgetting about cast times, melee doesn't have any cast times, Range does. Also Limit Breaks outside of Mechanist needs line of sight to be fully effective. Have bahamut on the opposite side of the pillar? Won't get damaged from him. Have a dragoons aoe ult come down but you're on the opposite side of the pillar? Don't take no damage. Have a BLM use their big purple circle aoe to freeze or burn enemies? Won't work if you're behind a pillar. The only range LB / AoE that i know that ignores LOS is the Snipe from Mechanist, you just need to see them first and if they get behind the pillar as the cast time starts, its to late for them.