Deep copying is important when you need to ensure that modifications to a copied struct do not affect the original. Unlike simple assignment, which creates a shallow copy, a deep copy recursively duplicates all nested structures and pointers. The manual approach shown here involves explicitly copying each field, ensuring nested structs and slices are also duplicated.
For more complex scenarios, alternative approaches include using the encoding/gob package or JSON marshaling and unmarshaling to create deep copies. However, the manual method is transparent, performant, and gives you full control over what gets copied. Choose the approach that best fits your use case and performance requirements.