It just shifts the pressure on to legendary gems then. We would get to pick 2 instead of 3 (arguably less of a problem than picking one of 2 sure but doesn't alleviate the problem)
If anything it should be moved to the HELLFIRE ring, so it is at least craftable. Up drop rates on keys to 100% on tVI.
But really it just shouldn't exist and all 6 sets should be 5 sets and Raekors should be a 2/3/4/ set not a 2/4/5