4.The Illidan problem
Let's be honest; People want to play Demon Hunters so that they can look like Illidan Stormrage. He's probably the coolest and most iconic character in Warcraft. People want to run around with those wings, blindfolds, and Warglaives. People want those runes over their body, and they want to wreck stuff the way he wrecks stuff. So how would this work in-game? Probably not too well. If you introduce Demon Hunters, you're going to see a surge of Night Elf male characters popping up all over the place. None of them are going to want to use regular swords or staffs, or whatever else DHs could potentially use. They would all want the Blades of Azzinoth on their backs, and anyone without those blades would be considered a noob. Would they want to wear helmets, shoulders, cloaks, and chest gear? Nope. They'd run around shirtless just like Illidan. They'll never want to raid because they couldn't look like Illidan while their raiding. You think Blizzard is going to create an entire item system just for DHs? I mean, they could, but I seriously doubt it.