glue theory

My theory about glue is that it should prevent things from coming apart - not hold them together. There are those craftsmen who maintain that with modern adhesives joints are not so important any more. I disagree strongly. How can we know what will happen to that glue in fifty years? Whatever I'm making should hold together without any glue - then it's well made. The glue is simply to stop it coming apart.
I'm not sure I'm going to win the Nobel prize for that theory... it seems odd that we don't know what three quarters of the universe is made from...