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The reason that neo4j admin bulk import doesn't employ multiple threads throughout the entire process is that it would risk creating inconsistencies in the database. Neo4j's transactional model ensures data consistency and ACID compliance, and concurrently importing data could corrupt the database. Additionally, the bulk import process involves loading data into memory, and parallelizing this process could result in excessive memory consumption and slow down the entire process. It is better to have a single thread to ensure consistency and also to limit memory usage.