Did the public actually "find out" about that? Or is that story coming across as just another rumor which they don't believe?
Right, that's why I don't see the theme of the importance/effect of organized religion in the game is examined as much as personal faith. Because nothing we the PC do actually has divergent outcomes. Our role as a religious figure doesn't change regardless of what we believe, what we tell the public, etc. It's about how we see our self after we learn the origin of the power. And it's about understanding that the public needs their own personal faith in us. If the public had decided that the Chantry wasn't fulfilling their needs and left it to become a disciple of the Herald, based on the Inquisition's action, then it would be a stronger reflection of organized religion. But to me it is about faith to individuals.
I'm still having trouble getting past the "it's optional, like dlc's are supposed to be".
I will agree with this one portion of the post to a degree. DLCs shouldn't necessarily have to be completely optional, although that seems the safest method of issuing new content without upsetting the players. Cory's origins in a DLC has been debated, but what we learn in Legacy is covered again in DAI at least.
With Trespasser, though, it really acts as the true end to DAI, an epilogue to it which will have far reaching consequences in future games. We were essentially asked to buy a DLC to finish the story and have the necessary information for DA4. The fact that it also was only available for current gen was a bit of a slap in the face for people with old gen consoles and I still don't think Bioware handled that entire situation well.
DAI had a trend of relying too much on tertiary source material to fill in the blanks. Assuming players had played previous game DLC, read the books or comics, etc. rather than containing that information within the game is an issue. Tertiary material should supplement game information, not replace it.