Personally i do not have a problem with not having some great backstory integrated in the game. Maybe there are others that think the same. I understand your point though.

Look at the plot and narration there are SO many Issues to fix. Especially the interaction between the characters, the characters and the story and the consistency of that. Just 2 examples:

Playing a cleric i decided not to take shadowheart into the group and found her fiddling with that gith cube-weapon. I succeded my arkana and saw it for a gith artifact. After that all chars seem to simply forget that. The encounter with the gith patrol is mainly about that thing but you can't even mention it.
Same when you find her fiddling with it in camp, either before of after the encounter with the kith'rak.

After the fight against the gith i picked up the slate, used it and the conversation with laezel takes place. After that you talk to her about the encounter. "let's find the creche we just located 1 min before".


Things like this are strewn all over that EA atm. If you do not follow exactly the order larian has planned out you will get those moments. I am not sure if adding another plot would help that. Also we do not know how far they are into writing the story for the coming chapters. Integrating more into that might be difficult.
BG3 is pretty blown up in some aspects already, even if it limits some of my options i would rather have a consistent, working game than a work of art á la "bethesda", meaning unfinished and buggy in the end.