it looks like there are MANY versions of the same series! first about ninjas' did anyone notice the plot shifting several times from small little OOC outbursts' like "i hate people who lie to themselves" to HUGE things like plots' pulled out of NOWHERE like the reincarnation thing, kaguya, ect then you have the last, and gaiden, and boruto which are a timeline of their own! plus other mini novels', rock lees series,various OVAs' and MORE
and THAT everyone is how you make scrambled eggs studio pierrot style! this isn't a series at all! just a bunch of ideas' crammed into one big giant mess! with no imagination, no creativity, too much carelessness about the characters', and the main original series, it seems like several different people besides kishi wrote naruto cause he can't do ANYTHING on his own!.
so, what's canon? fanon is canon! because even though they're kishimoto's characters' the series is EVERYONE ELSE'S' series! so...NOTHING IS CANON! it's every fans nightmare...or dream. i have read predictions for the chapters',doujinshi, fanfiction, seen fan art of naruto WAAAY better than what we really got!
I agree. I'd say that for me, canon ends at the end of the Pein Arc. I wasn't too thrilled with the whole forth shinobi war arc at all but I was completely done with it when the multiple power-boost transformation happened. I've truly read many fanfictions, doujinshi and fan art that are well developed, cohesive and make sense. I'd put all of those over the canon but I digress. I'd say that all of it would be canon technically because of how there isn't really canon system established in Naruto. I think the only things that are even considered to be non-canon are the movies (except for The Last and The Boruto film) but I have friends who consider it all canon.