But what's the purpose of grinding to 100 Paragon? It seemed like filler as soon as Blizzard announced it, especially if you no longer enjoy the game.
The Paragon system was implemented for a few reasons.
BAD drop rates, and No other end game besides Infernal Machine.
The Paragon system was meant to help with Magic Find since MF wasn't on any meaningful gear and still inst for the most part.