Nobuo Uematsu is my favorite composer!I have the whole Final Fantasy Piano Collection of him and I think those pieces are often just amazing. A lot of people might underestimate those pieces composed by Nobuo, cause it's "game music", but some of those pieces are really difficult, for example: piano collection's Eternity, Fighting, Decisive Battle, Eternal Harvest, One Winged Angel, are cool pieces and not easy at all!It would be awesome to see/hear someone as Lang Lang playing Nobuo's stuff, but I don't think a lot of people, who're really "into" classical music, would like to see Lang Lang playing that stuff. Maybe cause it's less serious or something, or just still the fact that it's game music, I don't know.Anyway, Nobuo composes amazing music and I it's the reason why I started to play the piano..... Thanks Nobuo, for all those great pieces!
I think rather than any prejudice against game music, that Nobuo Uematsu just isn't known of by classical pianists. Most established pianists weren't of the generation that grew up with these games.