I don't understand the piano-bashing. The piano is a perfectly legitimate part of a theatrical orchestra, and if anything it is underused. Is it possible you're talking about music only for the piano? Because even then I would still argue that pianos have a place in film soundtracks, but I do think I'd agree with you that it would be a bit narrow-minded to compose an epic film soundtrack entirely for the piano, as opposed to using a full orchestra that included scoring for the piano. But, then again, I'm not sure you were making that extreme of a statement. Perhaps instead you just need more exposure to film soundtracks. If you're not paying close attention, sometimes the piano can be easy to miss amid the bigger sounds, but nonetheless it is a mainstay in modern orchestra. I distinctly recall piano being employed in the Lord of the Rings and Star Wars films--sometimes very creatively! I took your assertion to the contrary as an exuse to listen to the Empire Strikes Back soundtrack again, and indeed the piano features prominently throughout the film, from the ice planet battle sequences at the beginning to the "Rebel Fleet and End Title" at the end. In fact, there are at least two pianos in that soundtrack. John Williams, maestro of the Star Wars films, got his start on the piano. I believe he said in an interview once that even today he still begins most of his composition on the piano. I also happened to remember that "The Battle of Endor III" (from Return of the Jedi) calls upon the piano when Darth Vader dies. I listened to the piece just to be sure. Now, I'm not going to listen to the full soundtracks of the eight remaining films (including RotJ) just to convince you, so don't take my word for it: Listen to these fine soundtracks yourself, and keep an ear out for the piano!
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