It is doubtful that treant wings alone provided sufficient loft to enable flight, serving primarily to maneuver and propel the treant through the air. The power of flight was imbued mainly through the benefit of spells, glyphs and runes, and (usually) did not breed true to successive generation...
As you note, both priests and paladins can share a focus on holy magic and still be unique classes. However, to say that DKs aren't necromancers simply because they're not the more familiar cloth caster that people are used to from other fantasy settings is simply incorrect. ...
Addons are tools that we use all use in World of Warcraft to improve our gameplay and customize our game to our will. As a tank, your highest priority is keeping your agro on every single mob you've pulled and also to have everything under control so your DPS and healers can stay al...