Why isn’t Juvederm Ultra Plus XC used for cheeks more often?

Juvederm can still be used in the cheeks. It is a more hydrophilic ("water loving") product, so it does create a "softer" look because it tends to draw in water. Voluma on the other hand does not draw in as much fluid, and thus creates a "tighter" lift, and the company claims that is a longer lasting result, hence the increased cost. In the hands of an experienced injector, both can have excellent results, but individual results vary.

I do not recommend Ultra Plus in the mid face as it is too subtle to give results. You could request the product but would need to be fully informed it is not the recommended product for mid face filling. Voluma provides more lift and is also longer lasting.
Warm Regards,

Dr Glenn Murray, Absolute Cosmetic Medicine

The choice for filler is dependent on the patient.   There is no one answer for filler, or where it should be placed.   Ultra Plus doesn't last as long as Voluma and is often lost below the cheek muscle and fat pads, while Voluma has a higher G prime and provides much more lift.