What AL tries to say but not say is way looser than what the Orthodox do with their economia. Under that, the person causing the divorce doesn't get to remarry and people only get three marriages. The grounds are narrower than "whatever you and a priest discern about your lack of knowledge and full consent". It still a departure from the Gospel teaching of indissolubility. 

And someone else brought up that AL is just as likely to help an abuser who divorces and remarries recieve Communion than an abuse victim. We've all been to a Mass where a liberal priest says "everyone is welcome to the table!" even though this is not what the Church teaches, you think priests really have the time to get everyone to discern?  In practice they will just wave everyone through.