WoW fights are barely less of "dance" fights than XIV has.
XIV is totally scripted at points, with certain mechanics Always targeting a tank, Always targeting a healer, and Always targeting a DPS. You get some instances where this bucks the trend though, like Savage Titan as an example, with the Orange/Yellow/Blue markers. There was enough variance there that everyone had to know all mechanics, not just their specific role mechanic.
WoW is a dance. Sorry. If it wasn't, DBM/BW wouldn't be a thing. You have fights where everything happens on a strict timer, but of course you have fights where things can be slightly variable or goes into a spell queue (Jaina), and it can cause absolute chaos.
Both games are difficult for different reasons.
WoW has the number of players game, on top of more "busy/tedious" mechanics (Xymox seed running. Someone's gotta do it.) , but can experiment some because of the amount of players in the player space.
XIV has more instant-death/punishing mechanics with more "imaginative" mechanics (seeing your own death in Alexander and how to avoid it), but easier to handle without a boss mod due to how extremely scripted it is 95% of the time.