5. Spending time actually leisurely talking with others once in a while is actually good for your sanity. If the only entity you're ever communicating with for days to weeks at a time is the demon soul inside of you, it might be hard not to start losing touch and eventually your marbles, especially if your inner demon is especially manipulative (nathrezim, shivarra, succubus, etc) and does more than just constantly offer you MOARPOWAH. However, you might be terrified of actually getting attached to anyone, you don't want the Legion to use that against you. Random, fleeting encounters with complete strangers in taverns and the like is the middle ground you need, to see all of these people and (well hopefully, depends on the crowd) remember what you're trying to protect in the first place, to maybe see children shopping with mama in the market place, or to hear some soldier in the bar talking about his old man back home.
Gan’arg: The mechanical masters of the Burning Legion, these engineers are the minds behind the devastating machines that help enact the will of Sargeras. To the demon hunters who find themselves staring one down in their binding ritual, perhaps they have an affinity with technology and a general understanding for the Legion’s war machines. Regardless, the Gan’arg represent very little threat to the demon hunter trying to control themselves.
It is completely acceptable, but harder to write, that your character has been a demon hunter sometime after the War of the Ancients. This is no different than people who have written ancient druids, and it poses the same exact problems in writing. I would not recommend this to anyone who is not a seasoned veteran when it comes to writing characters, as the longer your character has been a demon hunter, the older your character is, the more difficult to control the fel magic within, the more detached from society, and the more withdrawn they may become. Overall, it becomes incredibly harder to write.
The main topic for Classic at the moment would be whether the game is actually harder or just has more redundant activities you have to do before doing the stuff that's really fun. This is actually a good discussion to have, and not just for WoW, but gaming in general. The main sticking point for now, as most people are on (relatively) low levels is the breaks between killing mobs, especially for mana users. In the beginning it's actually refreshing having to think about what you can and can't pull, not just running into a bunch of mobs and killing them in *insert current optimal time to kill Blizzard determined is the most fun*. The food/drink breaks after a few (or even one) mobs provide time to actually look around the scenery and the mobs you're facing, and while there isn't much strategy involved at these levels, you still at least pretend to plan out how you're going to get to that quest mob without being killed by the 4 random ones surrounding them. Not being able to pull whatever mob you want, and actually having to check what mobs are there when you don't have interrupts yet (casters tend to be a nightmare) is definitely more difficult in a real way than what we have today. As a caster, having to actually think about which spells to use based on mana cost (and perhaps even using lower ranked ones) is definitely more difficult and requires more engagement with your character than we have in modern WoW.