As for the Divine, you don't really see those consequences, you read about them at the end of the game. The rest of their story is concluded in the DLC--which you have to pay for.
You have some bearing on Leliana's change, though it hinges on one dialog choice at the beginning of the game without any indications it's even important. Her end result if you killed her in Origins is so ludicrous that I would rather she didn't exist at all.
Nearly every choice feels like an illusion because the end result is so similar that it hardly matters, at least the seemingly important ones. Also, all final conclusions are in the DLC--which you have to pay for.
I don't understand your point here. You learn in the epilogue of DA:I how Leliana will be as a Divine, just as you learn how Emhyr, Ciri, or Radovid rules. How is this any different? The difference is actually that in Trespasser you get to see it, while The Witcher 3 is over and that will never be fleshed out more either in DLC or future games. The choices you made as to who rules the North in The Witcher also only exists in epilogue, therefore is it now a bad choice/consequense situation? I decided to have Radovid removed from the equation and Novigrad didn't change, the game didn't change, i wasn't chased or investigated, i got a 30 second epilogue slide just like i did with making Leliana Divine.
You say this last part like its a bad thing. DA is expanding, and we are learning more and seeing our choice's branching out. The Witcher will also have paid content and it will not touch the main story or the choices we made, and this is a good thing? I accept that people don't like how DA:I handled choices and consequenses, but in my opinion they did it quite well seeing where the series is and how many variables there is per save and how much dialogue has to altered etc.
PS - The second point was solved in Trespasser, quite brilliantly i might add.