Some music traditions where people was too poor to own an instrument have a long history of vocal music. Like Breton music.Usually a couple of voices sings the melody and stomps feet and a crowd dances to it. Probably Breton is the less fiddley of all celtic traditions but... however,I always thought that it was,on the contrary,a form of respect.Like:their voice is so worthy that they just don't mind about instruments...(which got me pretty gelous). But after all,so many instruments just come from trying to imitate human voice traits... Don't make it an issue,really.