Dont bother upgrading WoD heirlooms they dont scale and dont work as advertised : r/wow
Shadowlands heirlooms worse than green gear - General Discussion - World of Warcraft Forums
Relic of the past V nerfed or broken?
Bonus Objectives have been reduced by 66% for Warlords of Draenor on the PTR thus increasing the expected leveling time by an hour to an hour and a half. : r/wow
World of Warcraft's latest PTR build reduces the experience needed for all levels | Massively Overpowered
Gathering Exp Nerf in Shadowlands - Neutral Pandas Race to 120 Before Pre-Patch - Wowhead News
Patch 9.1.5 will have new Heirloom upgrades... but why?