What was the major drawback of the ambitious Reconquest of Justinian?

The major drawback of Justinian's ambitious Reconquest was the immense financial strain it placed on the Byzantine Empire. The military campaigns to reclaim lost territories, such as parts of North Africa, Italy, and Spain, proved costly and stretched the empire's resources thin. Additionally, these efforts led to overextension, making it difficult to defend the reclaimed areas against subsequent invasions and internal unrest. Ultimately, the financial burden and military challenges weakened the empire in the long run.