Although added to the database just prior to Warlords of Draenor's release and technically available to players, it is entirely moot. Arthas' Tears disappeared from EPL, WPL and Felwood in Cataclysm, though it was still possible to gather from a few herb nodes in Razorfen Downs. Now it even those were replaced when Patch 6.0.2 "updated" the Razorfen dungeons.
Although added to the database just prior to Warlords of Draenor's release and technically available to players, it is entirely moot. Arthas' Tears disappeared from EPL, WPL and Felwood in Cataclysm, though it was still possible to gather from a few herb nodes in Razorfen Downs. Now it even those were replaced when Patch 6.0.2 "updated" the Razorfen dungeons.
TL;DR -- Pointless.