Raids for World quests, why?

For quite sometime now I have noticed people converting world quest groups to raid when it is not a world boss or anything of that nature.

I know that quite a few WQs can now be completed in a raid, but why convert to raid, which is overkill and can bring other issues (like being unable to complete Wrath/Sab quests that coincide with the WQ or people not getting credit in the raid because they can’t tag the mobs before the mobs are zerged down).

Is it lazyness or something as anyone can make a group, and have it fill up fast so, again, why raid?