All I was trying to point out is that you were making a bold statement that lumped all of the women of the past together - to make an assumption that every single woman of the past had no discomfort with unsupported breasts is a huge assumption on your part.
As for your question - it really depends on what your definition of what a "normal" piece of anatomy IS when talking about artificial support. Eye glasses and contact lenses are forms of artificial supports to support those with "bad" eyesight. We get cavities filled in our teeth - that is artificial support. We have mentioned shoes already - I have a relative that needs specially made shoes to support his arches otherwise he is in pain - so that is an artificial form of support. I know of a person that has always had to wear a back-brace because of a brittle back bone (or something like that). I could go on and on.
As for the subject at hand, I know of several women who have told me that their bras help alleviate back pain. Great for them!
Don't get me wrong - the human body is AMAZING. But, it needs help from time to time, and if someone has an artificial solution, why is this a problem?