Strictly your opinion, and not indicative of the impressions held by the people who buy/use them.

The DGX and NP piano based arrangers are excellent instruments, and compete incredibly well in their intended market, in which their main, and probably only, competitor is Casio.

Putting down a product simply because it does not suit your needs, does not diminish it's value, for many people enjoy these instruments immensely...this is a very profitable market for both Yamaha and Casio.

Ian