Ted, you have no idea what you are missing by not playing full chords with your left hand. It adds some realism to the styles � it adds you. The more �I� can do the more realistic the keyboard sounds.
1-Big Band � my left hand adds another instrument controlled by me. A second brass section � some strings � a piano playing some beautiful changes.
2-The same for ballads.
3-Bosa Nova or some forms of jazz my left hand can strum like a guitar.
There are times when my left hand interferes with the style, then it�s turned it off.

I had a good friend who played accordion most of his life, he used one finger chords. He finally made the transition and said it added so much to his playing. After a month or two he became comfortable. The time and effort is worth the reward.

IMHO, John C.