The closing the breach cinematic scene fails to support the idea we needed a larger number of either templars or mages to close the breach. In the cinematic scene it is only a handful of templars or mages shown which is okay but doesn't help the only rebel mages or rebel templars motivation.
By the cinematic we already had enough powerful mages in the Inquistion to close the breach.
Only being able to use either the rebel mages or the rebel templars to close the breach just didn't work for me as a game mechanic/motivation. There was at least one circle of templars that could have been recruited. We could have had the option of collecting loyalist mages and/or dalish mages. Would have been fun to see Tevinter and the Qunari both provide mages and have to work together to close the breach.
Only rebel mages or rebel templars could help Quizzy close the breach just didn't seem to work in the way they were telling the story in-game.
Story-wise with the rebel mages and rebel templars, as we soon discover the obvious manipulation attempts by some entity, we should have been focused on rescuing the mages that weren't stupid enough to join the Ventori cult and the templars who weren't jonesing for red lyrium. And the time magic threat seemed important at the time if you went to Redcliffe.
To me the idea of recruiting what's left of the rebel templars when it becomes available makes more sense to then assault Redcliffe castle to save those rebel mages that will join you in fighting the Venatori and the stated threat of time magic instead of the risky commando raid we have to pretend is the best idea.
IMHO it's a better story and more epic start to get what templars you can salvage and assault Redcliffe castle. Saved rebel templars helping with saved rebel mages to fight a Tevinter cult threat that might be related to the breach and the destruction of their peace conclave. Maybe just hindsight but it seems a much better story. As opposed to what we have with a pretend this scenario makes sense motivation so we can, I guess, have another mages vs templars choice. Instead the end to the mage-pimplar war is mages and pimplars are all generally Kirkwall stupid.
As a bonus of saving some of both group, we still have choices on what to do with what is left with each group.
If you go to the templars instead the game just say the mages left Redcliffe and the time magic threat I guess was just a false alarm since Alex decides it's not worth it to find the Quizzy and use it I guess.
From a story perspective DAI is just what get's me to Trespasser. Although, DAI has many redeeming parts much of it becomes just filler for me that progresses the story with head cannon pretending that it all works as well as intended. In-game it's not a bad story continuation if I don't think about it much.
Happily since neither choice matters in-game I try to ignore champions of the just and in hushed whispers as just very superficial ideas that progress the game if you leave them behind.