As the title states, I fully believe they made the leveling system in 7.3.5 overtuned (longer/slower) to entice players to buy 110 boosts.
Don't get me wrong, I believe they needed to fix some leveling/dungeons issues with it being too easy but even with heirlooms, leveling is just dreadful now in my eyes.
I've made a few new allied toons and just going from 20-30 seems like forever. And now with BfA coming in a few months, there's 10 more levels on top of that.
No thanks.