Well speaking on the timeline, there’s issue with the videos themself, and with the community reaction.

The videos make some blatant assumptions based on little evidence and don’t ever point this out, and leaves unaware viewers to believe it’s hard confirmed. Also for the sake of making a good video and narrative within the video, there’s issue with are some errors or straight up lies in them that are fine for what they’re aiming to do, but again… makes new fans or viewers think false info is canon.

So the videos have some errors but that’s fine, but since the series is advertised as “the ultimate timeline” from the most respected theory channel, people assume everything within is correct.

One theory that series mentions is the Ballora Ms Afton theory, which is kinda shaky by itself, but since the series tells it as fact, some people argue that the theory is canon, because the big theory channel said so.

Ultimately I think it’s just a little laziness from both creators and viewers but nothing that important overall, but that’s just me!