It's a feature aimed at seasoned and returning players, this category does not play in story mode; story mode is aimed at people just starting the game. The majority of people playing the seasonal mode will play in adventure mode.
I am a returning player – from long enough ago that I am actually interested in replaying the story... and I think that I prefer the early game the most (when it's less chaotic), might or might not be related to me enjoying and completing the D3 beta with all the (then available) characters, which ended at lvl 12 and the Skeleton King ?
