You’re right. There are countless sci-fi stories about digitizing consciousness. One of my favorite book series is the Bobiverse series by Dennis E. Taylor. Many stories use the approach of directly downloading consciousness from the brain, many times destroying the brain in the process. The question is would it be easier to make a copy of it by monitoring the person’s behavior over a long period of time. This approach was used in one of my favorite sci-fi series, >!Westworld!<.