I have resubbed and bought Dragonflight. I am currently playing through the new Shadowlands stuff that was added since I last played, though sadly I won't be able to experience the new Shadowlands raids since nobody queues for raids that aren't from the latest expansion. I might have a review out on Dragonflight's content in a couple weeks. After that, I'll review the underground patch when it comes out, and then unsub.
I stand by my opinion that the MoP talent system was good. I quite dislike the return of the vanilla talent system. Spending an hour mousing over and comparing a hundred different nodes with inconsequential "decisions" such as +2% haste or +1 second duration on Divine Steed or adding some miscellaneous effect to Avenging Wrath is not fun. It is a complete waste of my time. The MoP talent system was good: it cut out the superflouous fat and presented you with 6 or 7 real, meaningful choices, like brand new abilities or passives that had a noticeable impact on your gameplay, and allowed you to build your character in only a few seconds, and allowed me to dive straight into the fun.
That said, the new animations on the talent tree menu are neat.
I do not like the new, minimalistic mobile game art direction of the HUD. The hotbar, target profile, minimap, quest markers, NPC quest icons, etc. It looks like it's from a cheap, uninspired mobile game. The old UI had flavor, with the dark parchment and the ornate metal griffons and wyverns and all of the fancy detailing. I suppose there are addons that could reverse this, but the new mobile artstyle now infuses most of the game now (started becoming noticeable during WoD and Legion), from the modelling of the characters and armor sets, to the texturing of terrain and doodads, to the spell effects, to the oversaturated the color palette. I'd imagine that if you walked into TBC Outland wearing new armor (post-WoD) and with the current UI, it would look quite jarring.
The official implementation of controller support feels halfassed. I got a better experience downloading the ConsolePort addon, which allows you to play using FFXIV's crosshotbar setup. However, you do not get the tactile experience of clicking on objects in the game world like you do with a mouse, which is one of WoW's greater strengths: immersing you into its world through interactivity. But the current design of WoW's gameplay where you have at least a dozen different combat abilities that are a part of your rotation (and that's before getting into miscellaneous spells and items), makes it uncomfortable for me to play with a mouse and keyboard. I don't want to stretch my fingers to reach the 9 key or spend a lot of time rebinding my keyboard and having to relearn my muscle memory. The FFXIV-esque controller setup allows me to comfortably fight without cramping my fingers, so I'll stick with that. (I still play GW2 with mouse and keyboard, but in that game you only ever have 10 abilities max, so it's quite comfortable to play). So far, ConsolePort's only failing is that vehicle controls are not bound, so I have to reach over back to the mouse and keyboard when a vehicle segment happens.