Hey,
Currently Barbarian's cut (1492128) dmg is based on the main hand weapon. However, some classes go all out on off-hand dmg with titles, artefact rune etc like w/r , b/w (even worse here because of low instrument dmg and lack of passive multipliers) I think it makes more sense for the skill to use the highest dmg source of a class for it's calculation (main hand vs off hand)You can use other gauntlets for such classes if you think it would perform better. This isn't supposed to be a global equipment. Also there are expected changes for all set piece hand equipments, shared as planned changes in website.
Greetings
Currently, I don't think any other gauntlet is relevant for the Off-hand chain class. But the change to Gauntlets of the fist seems interesting.