Actually, ALL ideological conflicts can be fundamentally summarized this way (although in real life you usually have about 50,000 slightly different proponents of each idea with their own ideas on how to implement them). Differences on implementation (realpolitik, as you put it) are not the same as differences in ideology, though..
What the OP argues about is the matter of realism in the political centre that is visualized in the game. While DAO did it nicely, DA2 however focused simply on Mage vs Templars. Sure, there were outside parties but they had never a focal point in the whole conflict that arose in the game. The Arishok had a nice build up and almost managed to put in elven oppression into it, but didn't add up to anything but for the very last quest. And Act 2 ended the whole situaion without going into its consequence.
And then we have the Mage vs Templar situation that is literally thrown into the forefront of things, like it now matters. It didn't have a build up, since previous acts focused on the Qunari, and every quest in Act 3 had reasons to say "mages are bad" or "templars are bad". One quest were mages and templars united was a good one, but didn't add up to the story at all. And the thing is, the game only ever focused on freedom vs order, and never bothered to focus on other aspects of it.
DAOmanaged it quite well, but there it is only showed in the Landsmeet, and while you het to demve into the social system, oppression, racism and such, it is also merely touched upon.
And there lies the problem. BW puts two things into the core of things in the game, does ok job portraying it, but touches on other aspects barely at all. BW are not bad at portaying politics, but to step up their game, they need to delve away from X vs Y and add A, B, C, etc in as well.