As someone who has already experienced the mountain of changes coming in Diablo 4's new Lord of Hatred expansion, I already wasn't expecting much from the new season that will begin shortly after it launches.
There are so many changes in Lord of Hatred that it already fulfills the purpose of a season that would typically introduce temporary powers or a limited story—with the significant caveat that it's a $40 add-on. Instead of placing a hat on top of a hat, Blizzard has decided to keep the focus on the new campaign and all the new system changes that come into play after the credits roll.
