To what extent do shared practices justify thinking of east Asia as a unified cultural region in the post tang era?

Shared practices in East Asia, particularly in areas such as Confucianism, Buddhism, language, and art, contribute significantly to the perception of a unified cultural region in the post-Tang era. These elements fostered cross-cultural exchanges and influenced social structures, governance, and philosophical thought across countries like China, Korea, and Japan. However, while these shared practices highlight cultural interconnectedness, distinct national identities and varying adaptations of these traditions also underscore the diversity within the region. Thus, East Asia can be viewed as a cultural mosaic rather than a monolithic entity, marked by both unity and diversity.