How about the fact that nobody has ever seen it or even mentioned it before?! Not by the Dwarfs who live in the Deep Roads, by the Grey Wardens who *are* in fact the experts on Darkspawn (unless you think someone should go around and stop everyone from saying that, since everyone thinks they are).not the Tevinter Imperium with their thousands of years of magical study and obvious interest in Lyrium, since it and Blood are the source of their supremacy?
Does none of that matter?! You still just wave it away with a 'well, people probably just didn't mention it because reasons'?! It makes all these people look corrupt and stupid purely for the purposes of this story, and is as cheap a narrative cop out as you can get.
In Dragon Age 2, the Red Lyrium idol has a sort of malign sentience that preyed on and exacerbated people's emotional flaws and heigtened them to a frenzy, insinuating itself as the solution to their problems. With Bartrand it spoke to his greed, with Meredith to her paranoia, and to Varric in Act 3, his sense of failure to protect and represent his family. In each case, the person believes the red lyrium is the key to solving their problems and needs to keep it close and protect it, Yet in DA:I, its just the red juice that Cory uses to corrupt the Templars and that's that.
In 'In Hushed Whispers' the 2 party members with you and Dorian are left for months in cells next to the stuff, and all it does is give them a 'This is the voice of the Mysterons' accent. When you and Dorian suggest you are going to go beat ALexius and stop all this Red Lyrium profiliferation, they are like 'Okay, cool - let's roll!' Given that Varric had previously been influenced by just a sliver of the stuff, and after only having handled the idol once years ago, huge chunks of the stuff don't illicit anything like as strong a reaction here.
It bears no narrative consistency with DA2 *whatsoever*.
And the whole Blight in the Lyrium as the reason Corypheus can control them, because he can control Blight? That doesn't seem to you to be a very convenient storytelling crutch to quickly explain why they are suddenly all loyal to him? And for that matter, why does he not use this power to control actual darkspawn, given that Legacy established that he could do just that? Its because they didn't want to use the Darkspawn again, and this was a new visual way to use the Blight. But it *is* a retcon, and as blatant a one as you could possibly ask for!
When a villain rips out a cannister of his 'Special stuff what lets me control the Good Guys' juice, and the story claims its always been there and its pure good fortune on the villain's part that it can do exactly what he needs it to do, then what more needs to be said? As is the fact that his regeneration using the Blight is much better than the Archdemon's similar ability, given that he can supplant mortal souls. And apparently destroy those souls, instead of being destroyed by them as the Archdemon was. Because.... he has a very strong soul perhaps?
Its all just 'The Villain can do whatever because he's the villain and sod what was written before - the players will believe what we tell them to believe'.Not to mention the fact that for the Templars angle to function, they had to bring in Samson and make him complicit in all this, despite the fact that Hawke can have straightened him out, and gotten the Order to reinstate him. Because even in the depths of his withdrawl, he still tried to help people, refused to commit evil acts for Grace's rebels, and helped fight Meredith, so he *knows* what horrors the Red Lyrium does to a body.
But no, yet another decision thrown on the scrap heap, because Bioware didn't agree with it, despite it being them who offered the choice in the first place. Like Leliana coming back because the narrative apparently couldn't do without her... except as it turns out, she basically does nothing and wasn't needed after all. Bioware are the retcon kings - this is hardly new territory for them!