Cosmos app chains often resist migrating to a fully modular architecture due to several challenges. The existing JSON-based state migration process, while cumbersome, is familiar and reliable, avoiding risks of in-place store migrations that require precise consensus version tracking to prevent chain halts. Developers fear introducing breaking changes without proper versioning, which could lead to failed upgrades. Additionally, the complexity of reorganizing data for modular systems, coupled with potential compatibility issues and the need for extensive testing, discourages transition. Governance and coordination for upgrades also pose hurdles, as achieving consensus across validators is critical to avoid forks. Lastly, the lack of robust tools for seamless modular integration and concerns over increased operational complexity further deter adoption.