Sola scriptura means at least this: that the church's proclamation is always subject to potential correction from the canon. It is for this reason that we resist simply collapsing the text into the tradition of its interpretation and performance.
Why must ancients, and provided the same talent, be better than modern authors? Free to exploit the vast realm of the simpleand the natural, they did not have to be artificial in order to be original (which every artist aspires to be).