Lacking many quality of life features that arpg's should ship with, this game stifles progression in an attempt to keep you playing. If you love the hack and slash (or raining meteors) in D3, go play it. This game is slow.
As a side note, they nerfed all defense, cooldown, and damage mechanics 2 days before season 1 launched. It definitely wasn't to get you to buy the battle pass for buffs to make your build feel complete again, no major corporation would stoop so low...