Read my posts on the previous page.
Destiny and Division are shooters at their core, not your top down, click-to-move, loot games. Players have a totally different field of view and means of interacting with their environment.
Destiny, for example, is a first person shooter. However, players can grab and throw objects, operate vehicles and navigate various kinds of platforms, among other things. In WoW, you can see everything that is around your character at all times. Destiny, you can't, without turning around. That alone makes both games incredibly different from one another.
Destiny features all sorts of lengthy jumping sequences and puzzles, some that are incredibly difficult and require precise navigation. Destiny being a shooter, you actually have to aim, and land your shots. Now add free movement, verticality, cover, strafing, reloading, ammo management, special abilities and enemies that pretty much make use of all those things too.
There's a greater emphasis on having situational and spatial awareness in Destiny, because of the limited field of view, and due to the fundamentals on how first person shooters operate and challenge players. You don't have any of that in a game like WoW.
My point is, do you really wanna be stuck in a raid with someone who can't aim or shoot properly? If they can't grasp the game's most basic mechanics, there's no way they'll understand or execute the mechanics in an end game activity. So unless the raids are dumbed down, with virtually no mechanics or puzzles, matchmaking with randoms would be a horrible experience.