Quite, Jack
I know of music sessions where having the dots out is the norm. Wouldn't be any use to me. If that's the norm they're welcome to it. For 70 years now, and indeed what we perceive as the old tradition with traditional song, the norm has been to learn the song you are going to sing. With me at least it's a respect thing. Matters not one jot what happens in classical music or any other for that matter.

And on the very rare occasions I go into a church I'd rather sing without the book, thankyou, but that's just personal to me.

Funnily enough most of the poets at our sessions take the trouble to learn their own poems. 4 out of 5 I can think of. And somewhat oddly the odd one out is the one that is the most dramatic and precious.