The reason, in my HUMBLE opinion, why Classic is so successful is because of the huge focus on gear and gold.
Let's not even spend time on the issue of gold in retail. With gold tokens, it's unfixable. Forget about fixing the issue of gold being a thing people care about, that is fun...
Noone in Classic wants to "farm mounts". Noone in Classic wants to "farm transmogs". Everyone wants to get great gear for several, both PvP and PvE, MMORPG reasons.
The "highlights" of 8.2.5 was Worgen/Goblin rework + some bee mount. Don't you think this is a problem? It's the only thing people care about. How fashionable u look with ur character model, transmog and mount. Nothing else matters...
Why would anything else than mounts and transmogs matter. With "seasons" and catch up mechanics up ur ass, what's the point in grinding current gear?
People are even complaining they don't feel like raiding cuz there are no good transmog class sets to farm... What happened to raiding to get some sick gear so u could kill some nubs in PvP?
"Every day we stray further from god.". Wake up Blizzard. Do you even understand what makes Classic so much more appealing than Retail? Or do you still, after all this time of Classic being successful, think Retail is better?