Star Trek fans have become very sensitive to introductions of new characters, aliens or historic events arguing that things that haven’t previously been mentioned ‘break canon’ or disrespect lore.
This piece by Inverse shows how profoundly TNG retconned Federation, Starfleet, and main characters’ history on the fly.
Worth thinking about.
I would say any story becomes ‘sensitive’ to additions of all sorts. As a story universe grows, it establishes more and more. As more and more gets established, there is simply more and more that new story has to fit in with. It’s basic.
A good story must be self-consistent, or what the fuck is even the point!? If literally anything can happen, then who cares about what happens or what makes the universe unique?
I’d say it’s not the fans who have become sensitive, but the IP owners who became indifferent to what makes Trek a unique, compelling universe.