Yes, I just wanted to formulate a compromise here quoting DNJ, but I totally agree that only in a "busy" style mix the piano sample is insignificant. In a light jazz combo where piano is in the focus the Tyros piano would already be non-satisfying for me. So maybe Yamaha will react and provide flash piano expansions in the future (of a reasonable size, not 1 GB).
But if you look at how few members in this forum care about a high-grade piano, it will,be up to arranger market research whether Yamaha is going to address it or not.