" some folks never get past the idea that "creating community" is not the only goal when people get together to sing. Those who 'mostly' sing without the book and know various versions of songs, and who know songs not in the book ALSO have a sense of community."

Sorry Bill, but I think you are making assumptions.   No one ever denied that people who "mostly" sing without a book have a true sense of community.

I'm afraid you aren't recognizing that there is a danger about losing community when certain actions are taken. I don't think anyone in the other thread said to "go by the book", many of us are simply saying that the idea of banning those who use it is wrong.