Hall of the Novice was a good start in the right direction, but they somehow decided that it was enough alongside mentor system.
While it indeed does help, the game fail at properly prepare new players to the content they'll deal with.
This is because of that, that this gap exists.

They thought than making dps check/making rotation and such easier was the way to close that gap. But that's where they are wrong.
Or maybe it did work, but only in Japan idk. But this game is almost availaible worlwide, so there's no excuse.