"We're not special. Wake up." Tabata says. So what is Final Fantasy disease? "It refers to people within the company who can’t imagine anything other than their own view of Final Fantasy," Tabata says. "Since the root is a strong self-affirmation, one’s own view of Final Fantasy takes more priority than the team’s success."
"If that view of Final Fantasy isn’t fulfilled, then they’re convinced that it’s bad for Final Fantasy," Tabata continues. "They think, 'Since Final Fantasy is a special team, then we are also special because we are making it. When the new Final Fantasy comes out, everybody is going to be so into it.' But that’s not the reality of the situation, is it?"
In other words, people assumed that a new Final Fantasy needed to fit the mold of what the series had been, and those working on the game assumed that it would do well, just because it was a Final Fantasy game. Tabata obviously disagreed. Interestingly, Tabata notes that once information about Final Fantasy 15 started going more public, he realized the infection was not limited to Square Enix. "Everyone has Final Fantasy disease," he says. I admit, Final Fantasy means something very specific to me, and I'm unsure how I feel about FF15 overall, partly due to the number of changes from that specific formula. source
My views: Tbh, I haven't liked the NEWER Final Fantasy games since Final Fantasy XI, because (impo) the newer Final Fantasy’s that end up on the larger consoles (PS4/Xbone) don't speak to a gamer like myself. They feel more like action adventure games & if I wanted to play action adventure type of game I'd play Kingdom Hearts or Prince of Persia (or etc), not the new crap that SE is pushing down my throat that this is the new Final Fantasy, deal with it. No I won’t. Because Final Fantasy to me is a turn based story driven game & it hasn’t been that way since FF:Eleven. So until it returns to that I outright refuse to purchase any newer Final Fantasy large console game. The handheld Final Fantasy games are done well, but it’s because they stick to the formula I enjoy.. Just with the large consoles, not so much anymore.