"Just because the performance is measurable doesn't mean you can forget the creativity factor."
The measurability of results has long been the Achilles' heel of marketing campaigns. Reach, print runs, coupons, etc. gave an idea of the possible ROI, but to be honest, this was always pure guesswork. The costs were measurable; the results were not.
Things are fundamentally different today. Digital marketing allows you to focus on specific and measurable goals: more clicks, more conversions, more leads, more sales... It comes down to having a clear call to action, and a quantifiable link between the (digital) marketing campaign and the results.