It's not even a matter of unbalance. I'd be curious to see what class literally cannot function without it. As far as I am aware it's simply an advantage/edge, as all combat artifacts are. Sometimes it can be harder to reach that level of edge when someone else has ALL the artifacts so maybe that's when not having it feels extra harsh, but I guess situations like that are probably the prime motivator for sales.
IDK kinda make me sick to think about. Probably not an idea that would come from anyone who had accrued any real wealth or investment. Really harms years of investments for some people and lots of hard work.