The whole franchise is based on a denial. People played these simple stories while they were young enough to appreciate them and that experience is being directly applied to anything that has come afterwards.
How is it possible for some people to keep FFX in high regard while other people think of it as the beginning of the end? It is because the whole subjectivity is what makes this franchise for each and all of us and it is directly related to our stage of life and accummulated experience at the point these games were experienced.
In fact not much has happened in the last decades. And to a great deal of people fond of the franchise, that precisely is the problem. It happened with FFVII to people who had played FFIV to VI, it happened with X to people who had played VII to IX and it happened with XIII to people who had played X. However now we have external factors to blame that people can use as a scapegoat like the departure of Sakaguchi and Squaresoft becoming SE, also Wada. They make for a great excuse for people to apply a creative fallacy to something they don't quite understand themselves. We are always looking for a reason for anything, and this franchise is the best example of a victim of that sort of thing.
In that case there should be no arguments about stories in general. Every story should be considered equal. That's not the case, though, as stories can be perceived objectically as well as subjectively which justifies comparing and analyzing them.It's not about people "not branching out enough" it's about what you personally define as a good story or not,
Kojima's productions can, also, be analyzed and when all is said and done it is not surprising that the end result does not hold up to the perceived grandness of his supposedly good storytelling. On the other hand MGS2 for example excels if not in storytelling, in an attempt to make a point about the dangers of media and its usage in general. This goes way beyond just the game itself though and starts from the early footage from pre-launch (with Kojima fooling everyone about Snake's role in the game) and continuing up until the dialogue with Raiden and Snake that sums up Kojima's whole point with the game.
"Why didn't you tell me the whole shadow moses project was all a lie??"
"You never asked."
Just like people believed that Snake was going to be the protagonist just because Kojima showed them some edited footage with Snake in it.
Brilliant. But anyway, MGS4 is a retcon after retcon. Still better than what the FF franchise has ever come up with though.