So I say screw it, who the hell cares? Saying Iga's universe is the true canon is like saying Shakespeare's plays around the Hundred Years War are the true history. Iga is in his own fantastical universe.
Clearly many people care. And a canon is important to tell a cohesive storyline. Speaking for me, I like the "folk tales" concept, but I like more plotlines that have a start, a middle and an end, even if the end is a cliffhanger (the current state of the main canon). No problem in preferring any other concept above this, though.
Though I get your previous comment's spirit (that there is not one single TRUE canon-- this really IS true, what there is is a MAIN canon, not a TRUE one), I don't get why you and many others try their darndest to kill the canon. Like, live and let live, y'know? Unless Konami themselves come forth and say there is no canon, then you got nothing. IGA's canon, like it or not, is the main canon for as long as it includes the quintessential, classic Castlevania games. Doesn't meant you should like it, but you gotta recognize a lot of people do care about it, is what I'm saying.
And, just so I'm not misunderstood, I'll repeat: There doesn't exist a "true" canon, only a main one. It's the main one because it carries the base to build the CV story, themes and gameplay elements from, aside from containing the majority of games. But that doesn't mean the other games are "less" true. They may be "less important" if you're talking "main plot", but are far from being "less important" in general, as cornerstones of the franchise. To be a true Castlevania, all a game needs is the IP title and official license. Yes, even if it means the game is a cursed pachislot.