Your sister is one person. I have friends that only watched the Avengers movies and liked them and felt that they understood them well enough. My dad also didn't watch the others and picked and choose which ones he wanted to watch. And I've never read the comics, yet I still feel this way. The characters are that self explanatory, their origin stories that irrelevant to the plot of the Avengers movies. So no, my Avengers argument is fine.
I've said before that I love the spinoff games. I'll repeat what I said earlier: "I'm not trying to undermine some of my favorite Kingdom Hearts games by calling them spinoffs. I'm just saying I wish the presentation was different, and no, not just with a superficial numbering system." To add to that, the numbering system is just a symptom of the larger problem, namely that an artistic decision was made to present the story in a certain way (and not a good way as far as I'm concerned), and the numbering system was made to represent that decision right in the titles. The only advantage to how they did things was that they got to experiment with the battle system a lot by creating spinoffs, and that created some interesting and fun battle systems, though none I would want to replace the main series' system.
And no, simply playing all the spin-offs wouldn't help everyone understand what's going on. It's a running joke even amongst diehard fans that the series is overly convoluted. I thought forevercloud3000 put it pretty well earlier: "Many of the Entries of KH games after 2 feel like Assassin's Creed level of "Spin off but A sequel but not". Those games wore the continuity out way too thin. And the a few elements they did add in are so boisterously convoluted they muddle the experience of KH3 once we finally got there. I am not alone in saying KH3 was a massive disappointment in the story department mostly due to the plot threads added in from all those portable titles."
And I'll ask again, why are you fighting this so hard? You're not going to convince me. I have the definition backing me up, and Kingdom Hearts cited as examples of that definition. That's enough for me. Just let me have my view. You're just like the other gatekeeping people before you. Sorry dude, but I don't have to agree with you to be a Kingdom Hearts fan. So you can be like Keybladewielder and Basil and Nautilus and white knight the series against me the internet meanie, but it doesn't make you guys any more fans of the game than me. I seriously cannot wrap my head around why you're so offended by the fact that I consider the non-numbered games to be spinoffs. Disagree with me if you must, but you're going to have to accept that I disagree with you.
Your dad is one person. Thanks for providing me the very argument necessary to disregard that entire paragraph.
Okay, so you claim they're spin-offs, but also claim the numbering system is an issue? Sounds like you're having an issue deciding one which hill you should die. So I'll reiterate again: the unnumbered titled make up the majority of the series and don't feature mere side stories (though you could definitely make a strong argument for Re:Coded). Days is a parallel story about Roxas that ties into the prologue of KH2 and is necessary to know about Xion. Chain of Memories is sequentially after KH1 and players would have no idea what was going on in the beginning oh KH2. Birth By Sleep sets up six important main characters, including the true form of the series antagonist. Dream Drop Distance is the same as Chain of Memories in that it picks up immediately after KH2. These aren't spin-offs, they are major chapters in a series that will leave you behind if you miss even one.
And I already answered your question. Multiple times. Here it is again: referring to these important main entries of the series as spin-offs sets them up as optional games for the story. The result is people thinking that they can play three titles in Kingdom Hearts and have a grasp on the story, only to realize they were dead wrong.
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