I never played in pianist mode, cause :
-The chord I want is never the good !!
-If I change a note of the melody in the right hand, and let the left hand pressed with the chord, the chord will change !!
-If you play a flute , or sax, or brass... or every solo instuments, you can't use the pianist mode...
But I know, for a good pianist, it's difficult to play the left hand with chords, whitout directly listen what they are playing... and they always plays somtimes just the bass of the chord... It taked time for me to play with chords...