A number of Single Fingered Chords require up to 3 fingers. Its very little more effort learn the correct way using Fingered Chords.
Single F C playing is limited to the types of chords possible to play. Once anyone has mastered full fingered chords they will get so much more enjoyment from their playing.

Dave is correct because playing single fingered chords the Roland way...you are automatically part way to learning how to play fingered chords.

Graham UK.