Classic plus isn't about QoL, it's about more content in classic, keeping the way the game is. No extra features like flying mounts, group finder etc, nothing like that - instead have it have more content in classic, like a new island with a new rep to grind or new world bosses or a new dungeon - stuff like that. I wouldn't add another tier though if you ask me. In my opinion, power increases were acceptable in classic but in TBC and beyond, power creeps were ridiculous.