Not only that but the "Classic +" community can't even agree on what the "+" should entail. Some want no changes to existing classes...but new raids, zones, bg's, etc. Others want to see the classes get balanced so that every spec is raid viable. Others just want some QoL features to be introduced. And some want some combination of all those things. Not too mention things I haven't even mentioned.
For myself, if I could take just one thing that's in later expansions but not Classic it would be enchanting vellums. But I know there's people on here and elsewhere that would call me an asshole just for thinking about that. And that's fine...because some of them probably have suggestions that I would find equally distasteful.