Every Resident Evil is like this though; I would say at least 70-80% of the story material through out the entire series is stuff you read from files. I thought Jill's inclusion was fine; she didn't have a terrible amount of screen time but her presence was still welcome and her character was kept in tact. I dug the Wesker children plot twist since it lends more credence to Wesker's super powers. I always thought him injecting himself with an unfinished virus yielding unpredictable results and intentionally killing himself was the stupidest thing the series has ever done narrative wise. While the Wesker children plot twist doesn't really retcon, it at least makes the existence of the super virus more tolerable.