This chapter, serving as the afterword of the volume, reflects on the overarching themes of standardization and localism explored throughout the book, with particular attention to law, the built environment, and the economy. It examines the complexities of defining ‘standardization’ across different domains, highlighting both its economic dimensions—especially in metrology and transport containers—and its broader cultural and legal implications. The discussion situates economic and legal uniformity within wider frameworks of imperial ideology, fiscal practices, and social norms, emphasizing the dynamic interplay between convergence and diversity. The chapter argues that Roman standardization was often approximate and inconsistent, shaped not only by material structures but also by perceptions of order and aspirations to uniformity. By expanding the scope of analysis beyond economic and legal regularities to include cultural and ideological dimensions, this afterword underscores the volume’s contribution to understanding the multifaceted nature of Roman-era standardization.