Too vague.

I'm just spitballing here, but my guess is that this quality will be used as a generic difficulty modifier for future events. 'Unburdened' seems like too broad of a term to be used in only this one event. Plus, it's even listed as a category when filtering your gear.

If it really were exclusive to this event, I'd expect it to be named something more topical, like 'Burdened by Mirrors, or 'Burdened by the Coil,' etc.