So, this isn't a particularly new sentiment. When M+ was first released four years ago, people pointed out the similarities between it and D3's Greater Rift system. They also implemented a blood shard system identical to Kedala. Now, I personally don't think cross-pollination of ideas across IPs is a bad thing. I just wish it worked both ways. Or, rather, I wish WoW and Diablo had more discrete design philosophies, because what would work in Diablo wouldn't necessarily work in WoW. It seems to me that after that initial cross-pollination, the developers just kept on designing for Diablo.The Absence of Meaningful SeasonsWhen you compare Diablo 3 to its biggest competitor, Path of Exile, the difference in seasonal quality is massive. Path of Exile introduces new mechanics and systems every season, with some of them becoming evergreen for the base game. Diablo 3, on the other hand, essentially rehashes the same journey, the same rewards, and all without introducing meanin