I mean, do you think it would have lived up to the hype? Maybe EA looked at the work in progress and realized it was going to be a shitty game. Maybe it was bland or boring or poorly optimized. There have been a string of high-profile disasters, and maybe EA didn't want to be the latest in a trend?
Would you prefer they finish developing and then release a shitty game?
Generic EA hate aside, they want to drive away from licensed IP. Their latest burn was FIFA, which was a long legacy of earning for EA with little to nothing effort... then they broke with FIFA (the organization) and now a big chunk of their historical earning is scrapped away.
The logic here is: "if the game is good, I bring more value to Disney, but then that fricking mouse (the non CC0) can kick me out and switch my press-work to the franchaise (on SW universe) to a company that directly compete with me (ie: Ubisoft)".