In all honesty, most players choose alternative weapons that will translate into builds for other expeditions or other build types, or simply because other weapon options are just better for output. For example, the only enemy type that Void Damage is more effective against is Ancient. With that being said, strike damage (War Hammer) is even more effective and is also more effective against Lost enemy types whereas the Void Gauntlet is very weak against Lost. It is just not the most optimal weapon choice when thinking about pure damage output. But, it can be a fantastic option for a healer to quickly flex as a DPS because they can still wear all of their Focus gear.