The speed at which you can switch targets that need healing is the big difference. It's also just a clumsy feeling way to target, compared to how switching enemy targets with the crossbar active feels. I see no reason why we shouldn't be able to have a filter setting for R1 and L1, allowing them to cycle through PC targets instead of enemy targets. Imagine if selecting enemy targets required you to drop the crossbar when dpsing. It would be a nightmare. Feels like an additional step to me, just to select a party member.