Uh, what?
Firstly, traps are baseline on live. Furthermore they can actually be used in combat.
Kiting matters on live too.
As for stings: there’s an argument for Viper Sting to be brought back but honestly with the current implementation of the stings (which is BETTER than Vanilla non-scaling nonsense) they are fine as PvP-exclusive skills. You didn’t use stings in PvE in Vanilla most of the time either.
Complexity? I mean, you had a lot of abilities but most of them were situational or reduntant. The core gameplay was definitely much simpler since it was just weaving Aimed Shot, Multi-Shot, and Auto Shot. I guess you can argue that there are more things to keep track of with immobility, ammo, pet food etc (all bad things for the class by the way) but I don’t see that as any sort of meaningful “complexity”. I would also argue that mana is less complex (also less enjoyable) than focus.
Don’t forget that modern Hunters have many things classic Hunters didn’t have like Disengage (the real version) and Camoflauge.
Literally the only things worth taking from classic Hunter are Eyes of the Beast, Distracting Shot, and Viper Sting. Maybe a few things Everything else? Meh. Look to MoP for guidance on what to do with Hunters in the future, not classic.
I just saw a thread yesterday on MMO-champion that said Hunter population is proportionally much lower in Classic and then it was 15 pages of people listing everything they didn’t like about Hunters and why they avoided the class.