The above quote from Torin Rettig is absolutely correct.  The immediate comparison that I thought of were the Dragon Ball Z series of fighting games, where there has been upward of 100 characters in a single game.  This can make it difficult to pick a character style that the player works well with, and degrades their experience.  Smaller rosters make it easier to pick your preferred character and then do exceedingly well with that character, which can make for some interesting match-ups with friends.

You just only have so much time to get good at so many characters. So we wanted to take that into consideration and release the game in a way that took that into consideration and allowed players to get in and play the game at the level that they want to play it.

Whilst the season pass has been confirmed, there has yet to be any details on pricing, or how much it will cover.