I think it comes down to what your used to. I've meet many very skilled pianists that find it very difficult to play on non weighted keys. Even well known performs playing in loud setting such Elton John, Alisa Keys, Billy Joel,and Lady Gaga play on weighted digital pianos rather than non weighted synth type keys. Why? Probably since they learned on acoustic pianos and feel more comfortable on weighted keys. Certainly their audiences could care less.... However most of these artist do have their digital piano set in an acoustic shell probably because their audiences would rather see them perform on a piano rather than a keyboard.