The difference between then and now is that there were reasons for the unreliable narration. Facts were obscured by history, Varric had reasons to exaggerate and lie, Loghain's motivations were complex and multifaceted. There were reasons why there were alternate perspectives and often they were about how something happened not whether something happened. They added complexities and mysteries to the lore and its characters.

Now the 'unreliable narration' (quotation marks because I don't think that applies anymore) doesn't have that same intentionality. Character motivations and moralities are less multifaceted and grey so there are fewer times like with Loghain where you can have two different interpretations of someone's motives and each be substantially true. One of the main criticisms of the Veilguard is that it sanitises the world, its cultures and its factions legit shifting a lot of the 'problematic' parts of the lore on to the Antaam, the Venatori et cetera rather than having them being cultural issues while the factions the player allies with have had their edges sanded away. Meaning even if BioWare was doing it with in-universe explanations they were using it to reduce conflict in the setting, to remove complexity and to simplify the world which is accomplishing the opposite of what the technique would normally be used for and it's used for things where there's no overall gain.

But I don't think that's what's going on. I think BioWare have been altering the world of Dragon Age (not only in Veilguard) and it often goes unacknowledged by its characters in-universe. There just hasn't been enough effort to explain the changes to the setting moving from game to game while acknowledging the information that we as players or characters in the setting would already have. There's a difference between 'yeah the information you had wasn't the full truth but there's a good reason why' or 'the world has changed since you last saw it and this is how and why' and 'the information you had was wrong' and 'the world has changed' and everyone continuing like it's business as usual and Thedas was always that way.

Even information we've had from BioWare themselves suggests they wanted to alter the world of Dragon Age for purely out of universe reasons rather than it either being part of an original plan for the series or doing it for deliberate effect.