Actually, choirs get good not by making noise but by learning to sing as clearly and quietly as possible. Think Gregorian chant. Simple music sung quietly and beautifully is within reach of any amateur choir.
I hate when baby boomers try and patronize my generation with "cool" and "hip" music. It just makes these people look like idiots.
And on key.
But the most important job of the choir is to lead the congregation in singing hymns. If the choir is not enough of a presence, the people don't know where to stop and where to start. It's frustrating. The anthems are the choir's treat, their chance to strut their stuff. Service music is a leadership role too.