While EIS has traditionally been considered an unreliable and insufficiently sensitive technique, this study demonstrates that its reproducibility falls within an acceptable range, challenging common misconceptions about its limitations. We show that the non-ideal behavior observed in EIS, which deviates from simple equivalent circuit models, originates from fundamental electrode/electrolyte interactions. These interactions, rather than being limitations, provide valuable insights into interfacial processes, revealing previously overlooked information that can enhance analytical performance.