I think this is the main problem for me, followed closely by the ~15 year old graphics.
The MMO genre has mostly moved on from 3 second pauses between sword swings, remaining motionless while casting a spell, and tab-targeting. Action combat is the current trend. And I’m ok with that. There should be progression.
Yes there was a slight update in graphics, improving some character models (goblin and worgen have not yet been updated), but compared to games like Wildstar, Blade & Soul and even ESO, the game engine really needs an overhaul.
I enjoy watching streams or reading a wiki to keep up with the story of a new expansion. I do not enjoy playing the game myself anymore.