You can buy a jump potion in the similarly loved (and still subscription based+buy to play) Final Fantasy XIV to jump straight to 50 or 60 and skip entire storylines.
You wouldn't say that if you had to grind 40 to 50 hours of level 50 content in FFXIV to get to the expansion pack content.
In contrast to most other MMO's, you can't just jump to the expansion after it comes out. You must have finished the whole storyline and every single-instance, normal group instance and raid-instance if they were part of the story.
I wasn't in that position, but my buddy, who started new on FF14, could do the 1 to 50 stuff in 2 days and the level 50 stuff in 8 days before he had access to the expansion.
Which was further complicated by all the solo instances where I couldn't help.