[Suggestion] Phase Garrosh until Level 90

So I'm introducing a friend to the game, and trying to explain what's happening. WoW is already pretty confusing for new players, what with the fact that we go through expansion content as 3 > 1 > 2 > 3 > 4 > 5, but my bud wanted to level a panda. When we arrived in Grommash Hold together, we saw Vol'jin on the throne, despite the quest text still asking us to speak to Garrosh. I was confused myself for a second, until I saw Garrosh standing off to the side for the purpose of this one quest. Both warchiefs in the same room.

I feel like it would make more sense if they just phased Grommash Hold for low-level players, and then unphased it at level 90.