Hmm. Honestly, I guess I just don't care about that sort of thing. Some of these characters, existing in a bastardized form in other media, (media which I will never see), doesn't really in itself harm my enjoyment of BG3. I mean after all, I'll never see it. It's more important to me that whatever goes on within this game makes some sort of internal sense.
Unless what you're saying is that you have to engage in those other forms of media to know the full story of this game? I'm a little confused by what you're saying.
My point is that any universe is supposed to make sense according to it's own set of internal rules. As said before, even we only use BG1, 2 and 3 as what is canon to the story of Baldur's Gate and nothing else, there are still many things that will never make sense. Of course we happen to have 3rd party content that is tied to and expands Baldur's Gate, therefore, unfortunately, when it comes to assessing the quality of the story, we HAVE to include everything that is considered canon and an expansion to the lore.
I think I can speak for everyone in this post that ignoring every bit of content other than the actual games makes the game much more enjoyable for everyone. Some might straight up ignore BG1 and 2, and only focus on 3. However, subjectively, everyone has their own lines as to how much they can ignore until it starts being too bothersome - for me, I have a cut-off point depending on the amount of mistakes and the severity of those mistakes. Once more bringing up Lord of the Rings, the movie adaptations missed a lot of things from the books, but for my personal enjoyment it barely makes a dent because of the masterful craft by Peter Jackson - but objectively speaking the movie has made errors that should not have existed. For others, those mistakes are enough to ruin their enjoyment, even including the lack of Tom Bombadil.
To sum up what I am saying - objective quality and assessment is crucial to your subjective enjoyment. A poorly crafted product can be enjoyed, and a masterwork can be no fun, but ultimately, it is important to be able to separate objective from subjective when needed, and use objective and subjective together when needed.
