Default is not canon however bioware has proven dozen o f times that the default world-state is not just their world state,but it also has the potential to influence all the players regardless of their choices.
The OGB plot was neutralized because their default world state was an Ultimate Sacrifice, the warden is absent for many reasons (including race's variability) and one of them is because their default was an Ultimate sacrifice.
Hawke is banished in their default so i assume that is really difficult that we will see the Champion again regardless of our choice.
In order to avoid annoying retcons they have decided to kill the major antagonists and protagonists of DAI that can be killed into an uncertain way (Corypheus,Calpernia,Samson,Hawke;Loghain;Alistair,Stroud,Abelas ecc..) to bring them back if they are needed.
So their Default is not just meant to accomodate new players but serve also to maintain a certain level of integrity in between the various games and that world state is more relevant in terms of integrity for the future installament than any personal player choice;who can produce at best in a triple AAA game a little and often meaningless cameo.