In universes like Stargate, like Star Trek, like Star Wars, there is a lot that is canonical. There are a lot of things that really shouldn't be changed, and a lot of things that people need to remember in order to make the story fit with the rest of the universe.
Unfortunately, like Star Trek Discovery and the Star Wars sequel trilogy, the show kind of takes everything that is canonical and completely ignores it...which is a trope for a lot of Science Fiction these days...and one that instantly alienates the fans that invested a lot of time, money, and love into the universe.