Unfortunately that's every game these days. Every single game you've played in the last few years had more content initially that was removed before release because they couldn't make the deadlines. It's due to all the money spent on marketing it, and the "ideal" time of year to release a game while also taking into account other games being released around your launch window etc etc etc Most of the time, delaying the game will lose the company far more money than just cutting out a couple of unfinished missions so the game can be released. It sucks but, with the amount of money thrown around the games industry these days, it's inevitable.