It's also the reason why Americans seem to value it so highly. The story's great, the graphics are (expectedly) better than its predecessors, the battle system is simpler, the game is not too hard. Americans prize these things greatly...
But 9 *feels* more culturally Western, with very little Japanese quirks to it. FFIX *seemed* like it was Westerners Disney's attempt to cash in on Final Fantasy, by loading as many FF references in the game as it could. Speaking of which, Kingdom Hearts (the one with the actual Disney cartoon characters) was beloved by Westerners (and YOU). By Japanese gamers...not so much.
YOU like FFIX because it appeals to YOUR Western sentiments. That's precisely why Japan passed it up. Not interested. Underwhelmed. Mediocre. Don't relate. Does not compute. That's precisely why it didn't sell as well globally. This is why it won't get a remake. Ever. It doesn't matter how much your American childhood's want it. No one in Japan is asking for it. Japan drives the FF market, not YOU (Americans). You get what they want, and you'll like it. SquareEnix doesn't listen to you as equals. They listen to its people, first...
Think about that when you feel ecstatic about SquareEnix keeping its FF7 Remake promise...