The species-dependent nature of interfacial electric fields has some important and largely unexplored implications. If different species are subject to different average electric field profiles, then the influence of electrostatic forces on processes that involve the simultaneous motion of multiple particles can be complicated and difficult to intuit. Basing one's intuition on the characteristics of a single potential profile may lead to erroneous predictions. Despite these challenges, this complexity has an up-side. A species-dependent electric field landscape admits a large design space for manipulating interfacial chemistry.