How would I explain this games never changing formula?

[Lan_Mantear]

I think the issue is that existing content becomes stale fast, and that is because we are encouraged to grind them over and over again. Wheeping City, like all the other raids, trials, etc, were fun and challenging when they first came out but after doing it ad nauseam and with increasing ilevels that allows players to completely ignore mechanics and still survive, it becomes more chore than fun. This continues on until next major patch release and the new content feels fresh and new, only for the cycle to repeat again.

Luckily, there are a lot of other things to do in game to keep boredom at bay. If you don't find enjoyment from those other things to tide you over, your only options are to take a break and wait for the next patch, or find another game.

The development team isn't stupid. They are very much aware of this, and it is likely their intention. It is their way to appease various play styles, and make it easier for extremely casual players to leave, then return, and catch up to their peers in a relatively short amount of time.