A modern days keyboard course learns the pupils many things..

There are excersises for :

- playing by ear
- reading music and playing as you read a new piece
- improvising
- memmorising your parts
- playing piano style, with left hand bass, or just 2 hands
- playing keyboard style with left hand chords
- improving skills trough playing etudes and other piano excersises
- playing in a band
- recording your own music, and playing on top of it
- creating styles, midi files and other backings
- using an arpeggiator
- reproducing the sound of acoustic instruments like guitar, woodwinds and brass on your keyboard
- playing keys and singing on top of that (even using VH )
- playing organ
- mixing music
- different kinds of dsp and how to use them.
- different kinds of synthesis

There are so many things a keyboardist meeds to know and do..
Both playing by ear as well as playing from sheetmusic belong to that..

There is allways something to improve..
There is no instrument as versatile as a keyboard..