A recent article by McCarty and Vitz "demonstrating that it is not true that pH = -log[H+]" is examined critically. Then, the focus shifts to underlying problems with the IUPAC definition of pH. It is shown how the potentiometric method can provide "estimates" of both the IUPAC-defined hydrogen activity "and" the hydrogen ion concentration, using the same assumptions and with similar inherent uncertainties. Moreover, it is argued that the original Sorensen definition of pH as -log[H[superscript+]] is preferable over the current one.