It seems like you didn't bother reading a whole lot about I said. Granted, I wrote a lot, but you should be willing to digest it if you're going to be critical.
I said that Mists is artfully done and the monsters are varied enough.
I also said that the tuning is such that there is *no room* for challenge. You didn't bother to dispute this in any substantive way, but rather latched onto my claim that I didn't care for the theme of Mists (which is true but also not directly relevant).
WoW classic had monsters that took a long time to kill and did a lot of damage. It routinely had densely-packed areas with many patrols. It had elites that you had to watch out for and sometimes kill.
Now, ten years later, all of that is gone. You also have more escape abilities, and more damage buffs. You don't even need that stuff. The game is more convenient and the mechanics more sensible, which is why it *makes no sense* that the game has also, incidentally, been tuned to be easy. We *know* it's been tuned that way, because Timeless Isle has been tuned to be *hard*.
I'm not saying that leveling should be punishingly difficult; they don't have to bring back 1.0, which had plenty of faults. I'm not even saying it should take a long time. I just think that while I'm doing it, I should be mildly aware that I'm playing a video game. They made it so consistently easy that leveling feels like *more* of a chore than if it had real, traditional video game challenge to it.
Let me put it to you like this: I'm not a huge Tetris fan, but I can play it for awhile and be entertained because it tests me a little bit. If you changed each block into a square, and then tried to entertain me with some animations on each square, then I would not be pleased and would quit very quickly.
Games must be games, not rides. They don't have to be *really hard*, but they must be reasonably capable of allowing the player to deal with failure.
In WoW at this moment, there's no room for any challenge in leveling and that's totally by design. They know how to do challenging.