If someone wants to follow their own AU/canon (of any franchise) rather than “canon” That’s perfectly fine and makes things more interesting.
Like, I once saw someone who said they considered S1 of G4 non-canon, I wonder how their AU/canon goes during where S1 would be. How did Twilight meet the M6 in theirs? Or what happens to NMM.
Also, it would be interesting to see what some versions of other people’s canon. Like in the episode where the CMC got their cutiemarks, for example. I consider the contest and all non-canon, but the CMC did still get their marks through a different situation. It would be interesting to see someone’s canon where the episode never happened and how or what their marks looked like, if they are different
Or someone’s canon where maybe… A particular dies or something instead of being redeemed. With their redemption being non-canon to them. How would the rest of the show be different? How would the other characters fix a situation where the redeemed character was needed in the original?
Interesting to think about. If everyone followed the actual events and saw it as all canon. It would be a pretty basic and boring fanbase