So my point is that so much crucial plot progression occurring in side games (for argument's sake I only call them side games because they have no number, and so they likely sold less and less people played them) will make some KH3 players irritated (likely moreso than KH2). You stated that all these games were important ("The only true side game is Re: Coded"), so of course you're reinforcing my point!
You missed my point. I am by no means dismissing the usefulness of memoirs. I'm sure you read my whole phone thing, so surely even you agree it's a bad way to present plot. I know, wouldn't really matter, unless the plot is supposed to me so bloody important, which it is, and unless the plot has gotten so bloody convoluted as Kingdom Hearts, which it has. Than it really, really does matter. In contrast, with KH1+2, they cover the plot of that same game in case you didn't understand something- who wouldn't think this is a good idea?
I didn't- read my post again.
I personally think you're dead wrong to think that important plot points don't need to be recapped within an epic finale. Also what's with you acting as if I've slapped you in the face?
A good game should be accessible to anyone (read my earlier posts on this if you want) A casual person should be able to feel satisfied with KH3 without studying the lore, at least in my opinion.
I believe I heard somewhere that KH is actually more popular outside of Japan, so it would make sense to release it overseas. We can hope so anyway 
See? And that's exactly the problem. It's not the fault of the games that less people played them because they had "no number in it". The number doesn't mean squat. These KH 3 players won't be irritated if they actually put some effort in learning about the important stuff, as by the time KH III finally comes about there will be
vast possibilities to do so:
1. Informing through the net.
2. Play the actual games (which will mostly be negated by point 3).
3. Take a look at the HD Collections which bring it all together (most likely on the same console as KH III).
4. Use KH IIIs built-in feature for the background lore.
Point 4 is of pivotal interest as I doubt that they'll skip that after they already implemented it in DDD. And we don't know for certain how they will implement it in KH III anyways.
The point I make is that there is no need to be irritated as (which Master Spockanort also pointed out) there is enough possibility to inform yourself. People who watch Revenge of the Sith first or Return of the Jedi with informing themselves of the Phantom Menace and Attack of the Clones or A New Hope and Empire Strikes back are going to be irritated as well on some plot points.
You won't get a full blown recap of everything in any final episode of something.
To be completely honest I don't even understand what that telephone bit was supposed to be about. You cannot explain all this stuff in-universe because there is no character in-universe who knows every connection and how everything ties together. Not even Yen Sid, Xehanort, Ansem the Wise and Naminé, who are the four most knowledgeable characters in-universe, can explain everything that is covered in the memoirs because they don't know some of those connections.
Take the events from BBS as an example, no one could give a clear testimony in-universe about what occured there in full because Mickey or anyone else only experienced bits and parts of the whole tale.
Furthermore, as the Xehanort Reports in BBS show, some people in-universe are shown to be quite unreliable narrators and do not give information objectively like the memoirs or journals do.
I just re-read every chronicle and then the glossary in DDD, and I can actually piece together the "convoluted" plot of the series so far pretty neat at least on a surface level without consulting any interview or one of the other games.
DDD also covers the plot of that same game, in the reports section of Sora and Riku as well.
But they are recapped, and I'm quite sure that KH III will feature something similar to the memoirs as well. I'm not acting like that, if it comes over that way I apologize, I just for the damn can't wrap my head around what you exactly want more? Everything needed to know IS THERE, it only requires a bit of reading.
A casual person should also be smart enough to know that if he/she buys a later installment of a series with a continuous story that they might encounter plot points from earlier installments they don't immediately understands. If said game provides opportunities to get up to speed on things in-game there's enough done. People who already know what's going on would only be bored by escalating recaps (and it takes important game time, too), so the developers have to balance things out. The casuals cannot expect to get everything spoon-fed.
There are so many examples, like in Lord of the Rings, if you start with the Two Towers, do you really expect that they explain again how Boromir died in Fellowship, the first book? Nope, they just inform you that he did and why in one sentence, no lengthy recap despite it being a major event and plot point.
In terms of numbers that's not so surprising since population in the west is generally higher than in Japan, but them including the blatant hints in western releases as well as the possible gain they could make it leaves already a strong impression for a western release.
