With respect... throwing decades worth of universe lore under the bus for the sake of nonsense last minute plot twists and sudden drama seems to be quite exactly what a lot of folks are complaining that BG3 is doing, too...
How exactly if I may ask? BG3 problem is that act 3 is barely playable and issues like Minthara's scenes not triggering or Gale romance ending persist through patches. Emperor vs Orpheus isn't the best story I experienced, but I don't think it throws the lore under the bus for the sake of plot twist. Other than that I can't think of anything that could be treated like cheap drama or retcon (Astarion's ending is questionable, fine, but that wouldn't be a problem with epilogues). And comparing it to the damn star brat that killed Mass Effect franchise is way too big stretch
