The only thing I find annoying about this are the ones who do none of those and still complain that they're missing on the story. It's 2016, you can watch everything on Youtube for free if you don't want to support the company. I don't like the console spread either, but they're free to do with their game what they want. SE doesn't OWE you to be able to play all the games on one console. The remixes are a pretty good compromise anyway, so I don't see the problem here.
This is practically the main gist of it.
People are free to not follow the side titles for
both the reasons of not having the money or not having the deeper interest.
They're still just as much a fan of the work as the dedicated ones.
However those have really no business to complain or bitch about the story when they can't be bothered to actually follow it as there are enough possibilities nowadays to get on par with required knowledge without needing to buy several consoles.
It has been stated more than once that these other titles
are important to the overall story and that you can in fact NOT follow it by just playing KH 1 and 2 while being an (read this as a purposefully exaggerated statement) entitled elitist fan who decries any entry of the series not having a roman numeral and not being on a home console as "unneccessary".
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On a side note on this "waiting for 10 years for KH III"-issue, that really comes over as ignorant and entitled because it was
officially stated that there would be no KH III for quite a while.
This isn't like Versus XIII/FF XV which
was announced and then descended into development hell for several years, making fans of that title arguably
right to feel cheated and "betrayed" somewhat. KH III
literally was not a thing which was stated more than once.
It is true that the handling of the handheld titles and also their quality leaves much to desire in some areas, as well as the mess that Versus XIII turned out to be resulting in a much bigger time gap I think even Nomura expected, but that still doesn't change the fact that these fans were literally "waiting" for something that was
announced to
not come several times during the time period 2005 to 2011/2012.
It was only around 2011/2012 that it was even confirmed that there would indeed
be a KH III at all with Nomura speaking about some concept work and Re: Coded as well as Blank Points from BBS pointing towards KH III, but the
official announcement was only at E3 2013 and strictly spoken
that's the date one can earnestly start to count waiting time.
Anyone who was "waiting" for KH III in the years between 2005 and 2011/2012 was actually waiting for/chasing a non-existent phantom or a victim of wishful thinking. Any feeling of "betrayal" or similar is unwarranted simply because neither Disney, Nomura nor SE ever declared/promised anything that
could be betrayed.