These people seem to either forget, or stopped giving a shit, that they're making a sequel (or in cases like Fantastic Beasts, a prequel) to a product. In the process of "challenging expectations", they destroy characters like Joel and uplift characters that are very much forgettable or hated. This is the same shit that happened with The Last Jedi. The once hopeful and courageous Luke Skywalker turns into a fucking hermit for such piss-poor (if any) reasons and people are supposed to deal with that and focus more on Rey.
In that light, when we watch an anecdotal universe, we're learning the standards of that universe, its history, and its characters. We do this normally with the goal that we can comprehend, anticipate, and respond to occasions, similarly as we would in reality. A standard infringement triggers a mind's "I've misread everything!" reaction in a way not proposed by the writer, rather than a writer releasing an energizing huge uncover or "aha!" second - "No Luke, I am your father!" When a group infringement occurs, rather than moving with the story, the watcher is confounded and attempting to accommodate the new information with the old model. They're in a high-stress state since they've unexpectedly understood that their psychological model of the anecdotal world might be lethally defective, and that is never an agreeable state for a wise being who thinks the exactness of his psychological model is significant.
But people who attach no importance to the fictional universe, the "non-fans", don't go through this because they have no investment into their mental model of a fictional universe that they don't value. Non-fans won't have a reaction to a canon violation, anymore than a bass fisherman would react to a Paris fashion faux pas. They neither know nor care and just enjoy the pretty show. But a fan's enjoyment will likely be destroyed as their Destruction and Creation cycle gets triggered. They are sitting in their seat, madly trying to make sense of a shocking revelation, yet it is a revelation the author never intended, and one certainly never intended to be upsetting and stressful. The blissfully ignorant author thought it would just be cool if a character could suddenly do X, Y, or Z, while the fan is reacting as if he'd just beheld a scene that said Jesus was gay or water flows uphill. He's taken completely out of the movie and spends the rest of it wrestling with the logical contradictions and implications. He comes out upset and unsettled.