I don't see what actually changed; do you have examples? Sure, some stuff became more evident, but that isn't the same thing.
The biggest thing that comes to mind are topics like rape and torture (issues that appeared in Origins and The Calling and probably elsewhere). Gaider has apparently removed his blog but you've probably been around long enough to recall the episode on the forums before Inquisition's release about removing/editing content because a female writer pointed out that a situation in game could be construed as a form of rape.
Now, whether or not that edit was necessary or made the game better I'll never know, but to me it highlights a shift in BioWare's willingness to touch on that topic.
On torture, in all the pre-release speculation about Inquisition the topic came up here in the forums several times. After all, when one hears Inquisition they immediately draw parallels to real life inquisitions and what those entailed. These threads would get locked in short order and Gaider in particular seemed vehemently offended by the question on if torture would be in the game or not. I found this to be really odd, again, considering past material written by Gaider himself. Torture was never shown in the act in Origins but its aftermath played a pretty huge part in setting the scene for both Fort Drakon and Howe's estate.
Come Inquisition we see Leliana being "tortured" for useless information a year after the fact while fully armored. Compare this to the beginning of the Witcher 2 and this difference in presentation is staggering. BioWare would have been better off just tossing Leliana into a cell to be freed rather than attempt a torture scene they were unwilling to present in a way that didn't break immersion.
Now some other things...
Being evil and doing self-serving things...it's not really an option in Inquisition. Almost all decisions you can make are limited to the main story or companion quests. Emprise du Lion is the biggest exception with Imshael and the options are laughable.
Riches: 3 gems to vendor
Power: Sure, here's an amulet of power...for Cole
Virgins: He doesn't even give you virgins and I'll get to this point later
Origins let you do a bunch of assholish or just plain evil things for various motives and personal gain.
Sex and flirting - it's limited to your inner circle/companions and Harding. There's no brothel (in Val Royeaux c'mon!) and there's no flirting or bedding the various nobodies you come across in your travels like in Origins. There's also no stupid but funny sex option like the desire demon in Origins or Morinth in ME2. Imshael could have served that purpose but he didn't.
Then there's the "Sexuality in Thedas" codex and it's established as well that Orlesian nobles don't care if you sleep around outside of marriage. Homosexuality being completely accepted was something that was really introduced in DA2 and carried on into Inquisition. Zevran and Leliana in Origins didn't leave the same kind of impression.
And in regards to nobles and their paramours it's just too far beyond belief that issues of paternity aren't a concern.
So right there you've cut out two major sources of conflict, and dark fantasy is dark because it contains such conflicts and social issues.
And again, Orlais' portrayal was horrendous. They really dropped the ball there.