The downvotes are puzzling to me as well. Maybe I hit a nerve with some people who truly think there's something more to canon and non-canon... But the concept of non-canon was never even a concept until corporations starting wrecking havoc on the original lore so people had to come up with a way to explain it.

If George Lucas was involved in say making a Star War video game in the 1990s with an intricate storyline that followed the original plot perfectly then no one would have bothered distinguishing canon and non-canon but when you give a bunch of B-List sci-fi authors the ability to write anything they want for the IP such that half the books released contradict each other regarding timelines of events and characters, people are forced to distinguish otherwise the "lore" doesn't make sense. It has got so bad in modernity that some of the choices producers are making regarding characters and "lore" is outright self-destructive that people are forced to not consider it canon to preserve the sanctity of the lore even if theoretically it should be canon, it's just the producers do in fact want to destroy the original spirit of the lore. So now it's just a game between producers and consumers regarding what stuff the consumer likes and doesn't like. Whatever the consumer likes will be canon and whatever he doesn't like won't be.

At the end of the day, producers are trying to destroy the original spirit of these fantasy worlds and are mad consumers are fighting back with things like "that's not canon" to preserve the core essence of the fantasy worlds they love.