A few reasons- It's a stat that can benefit hunters ranged ap as well, so the weapon can be used by rogue, warrior or hunter (in general, but not in the glaives' case)- It's a bonus that has additional scaling compared to flat dps, depending on class and buffs (e.g. shaman 10% ap thing, talents with % bonus to ap, etc)- It's part of the original design of itemisation to make it less boring (basic vanilla weapons added str or agil, again ap is universally good for alll classes that can use it)- Ap directly affects some attacks that dont depend on weapon dps (warrior bloodthirst, druids in shapeshift)- probably some other reasons i forgot
To all the people crying about wowhead didnt told them what to do:They told you: Combat Rogues gain more DPS from The Twin Blades of Azzinoth in a single-target situation like most bosses.Fury Warriors gain more DPS from The Twin Blades of Azzinoth in a multi-target situation like most trash packs.But to make it easy for you: if you needed to go to wowhead to check which class you should prio, then your guild should prio rogues.
I mean its the only two classes who can use them. Rogue for Single Target and Warrior for AoE like the article said :)
TL;DR GM will ninja it first and then disband guild