As you know, copper is the number one choice for new construction and a lot of remodeling.
I agree that acidic water should be treated but, you didn't answer the question as to why plumbers install copper on acidic water, or why the plumbers don't test for acidic and other things that damage copper.
Dipper, trust me, he took offense at your statement which he sees as anti plumber (although you are right). He's done it to me many times. I say most plumbers concider themselves as taking care of the health of the world , but don't give a damn about the water quality exiting the water pipes they install. Well, unless the material is not copper, then they howl.