The fundamental assumptions made in the revised Kubelka-Munk (KM) model of light propagation in scattering and absorptive media, recently proposed [J. Opt. Soc. Am. A 21, 1942 (2004), 22, 866 (2005)], are critically reviewed and analyzed. The authors argue that the model, now questioned by Edstrom [J. Opt. Soc. Am. A 24, 548 (2007)] is well founded on physical grounds and consistent with the original KM model, which has been the cornerstone of light propagation studies and utilized for more than half a century. (c) 2007 Optical Society of America