I guess we can define the terms however we like. An acoustic piano also has a keyboard. My point was that "keyboards" include a much broader class of electroni

I guess we can define the terms however we like. An acoustic piano also has a keyboard. My point was that "keyboards" include a much broader class of electronic instruments than strictly what the set of "digital pianos" includes, like synthesizers, MIDI controllers, semi- or unweighted electric "pianos", etc. Unfortunately, to the beginner, they all look the same.