Abstract: Zoned Namespace (ZNS) solid-state drives eliminate the performance overhead imposed by the “block interface tax” in conventional SSDs and have already demonstrated strong performance and application potential across diverse domains, thereby creating new opportunities for building high-performance storage systems. However, by offloading garbage collection and address mapping to the host and introducing zone partitioning with strict sequential-write semantics, ZNS reshapes the storage paradigm and thus poses new challenges. This article systematically surveys three central challenges in ZNS-based storage systems—write amplification, parallelism, and data consistency and reliability—and synthesizes optimization techniques, recent progress, and representative studies for each dimension. We also review ZNS-oriented emulators and auxiliary tooling that support performance evaluation and instrumentation. Finally, we outline promising directions for future work, including cross-layer co-design, multi-tier heterogeneous integration, software-stack optimization, and efficient global optimization with adaptive algorithms.