"I'm not sure I entirely agree, I"
Nor am I Tootler, though that's what I've been told
I do know that falsetto is not natural to men and in order to produce it in young boys to make them choristers (or to train them for opera) it was once practice to castrate them
THE LAST CASTRATO, ALLESSANDRO MORESCHI, DIED IN IN 1922

I think the point about traditional singing, certainly among the older generation of English language singers (England, Scotland, Ireland, US etc), was that they regarded their songs an narratives and the function of the voice was to pass on the information the song contained, so the more 'natural' the better
In Ireland they talked about 'telling' a song and I've read about Scots singers "saying" a song
The more natural the voice, the better the song is carried
Jim Carroll