I know that Rowling treats Harry Potter and the Cursed Child as canon, but given that it wasn't part of the book series, is a play, and she didn't actually write it alone (which makes it a multi-author fan play to my mind), do you think it's canon? I ask as someone who treats as core canon only the book series, and as supplemental canon, Fantastic Beasts and Where to Find Them, Quidditch through the Ages, and The Tales of Beedle the Bard. I never got into Pottermore, and since that info wasn't available to everyone (without jumping through hoops) and was changeable/removable, I've never treated it as canon any more than I've treated Rowling's extra-book pronouncements as such. I have no intention of treating a play written well after canon's close with other people as canon, and movie series canon is just that, movie series canon—but that's just my opinion. What's yours?
Is Harry Potter and the Cursed Child canon?
P.S. Perhaps you think that Cursed Child is canon, but you're going to ignore it (much as you do the Epilogue)? I should have made that a question in the poll. :P
P.P.S. Given that this is fandom, does it actually matter if it's canon or not?