Blizzard should add a tabard that provides a buff equal to the total xp buff given by a full set of heirlooms, but does not stack with any heirlooms. That way gear progression becomes a thing again whilst leveling for those who want it without sacrificing the xp buff or removing heirlooms for those who like them. The tabard is earned by having a set of heirlooms that are capped. Thoughts?