Leveling sucks is a huge issue. Why? Just look at history:
BC: faster leveling than vanilla -> 2.4 Quel' Danas dailes
Wrath: faster than BC, Heirloom, Dungeon finder -> More dailies at level capped
Cata: faster than Wrath, Azeroth Reforged, Linear questline -> More dailies at level capped
MoP: faster than Cata. Level capped boost, xp potion -> Mandatory dailies
WoD: faster than MoP. Free boost. stat squish->xp squish too. One-shot mob -> Garrison and apexis crystal grinding. 2hours get to level cap (From lv1 to lv 100). Flying achievement
Legion: WTF?????? -> 60m AP grinding, Legendary grinding, Flying Achievement grinding. Mandatory grinding to enter the Arcway and Court of Stars dungeons.
See the trend here? Fast leveling ruins the entire experience of this game, solves no problem and even brings more issues.
What I laugh at is Arena Minigamers don't want grinding AP because they think it is PVE content. lol