Hello John. I too agree that using banjo-picks is OK for guitar. I used them originally as being a banjo-picker as it felt more natural to me. That ‘bell-tone’ release sound of a banjo-pick is hard to beat. Over the last year, however, I’ve settled into using only a thumb-pick and bare-fingers, but I’ve grown my fingernails out to use a combination flesh & nail attack on the strings which I feel sounds almost like using fingerpicks and I find (at least for me) it requires substantially less force than flesh-only for a given volume. That said, I think flesh-only gives a more ‘jazzy’ or ‘smoky’ sound. In the end, it probably depends on what sound you’re after.
Fingernail disclaimer: Although I find picking flesh & nail produces a pleasing sound; Picking with nails comes with a cost. I find that I spend a little time maintaining my fingernail profile (shape). Banjo picks obviously do not require such maintenance. Happy Picking!