In the olden days things like warhammers weren't spikey sledgehammers, they were more like a large carpenter's hammer size wise. Battle axes looked more like hatchets than giant double bladed throwing axes. Longswords were pretty rare. The average fighter's hand weapon was on the order of 4 lbs (2 Kg) in weight. The same actually holds true for modern weapons, most assault rifles try to come in under 8 lbs (4 Kg ish) because a soldier usually wields the gun with both hands.
Why? Because that's the normal upper limit for a person's grip strength. Any heavier and it's not the swinging arm that will give out it's the fingers that tire.
With that in mind, I thought this was a really interesting device, . Practically this would be a really useful addition to a soldier's kit. There's one problem with including it in an RPG, most players would gloss over it. "It doesn't do more damage in HTH? What good is it?" When in real life it would allow the average guy to carry a 50 cal BMG rifle (20 lbs) like it was a regular rifle.
I put Wielding Mass in as a rule for The Artifact because of this limit but I doubt anyone other than me and my rules editor would pay attention to that rule.
Can anyone else come up with a way to convey the usefulness of a powered glove without relying on a HTH damage modifier?