Not all state changes trigger events, reducing transparency and off-chain monitoring capabilities.

1. Code Clarity: Removing or using unused code improves readability and maintainability of the contract.

2. Gas Optimization: While the impact on gas might be minimal for a single unused error, maintaining a clean codebase can help in reducing the overall bytecode size, potentially saving gas costs in deployment or interactions.

3. Future Proofing: Keeping the code free from unused elements helps in understanding the contract's behavior more clearly, which is crucial for audits, upgrades, or when new developers join the project.

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This cleanup also aids in focusing on the functional aspects of the code during reviews or when performing static analysis, reducing the chances of overlooking actual issues.

Add events for critical state changes, like token transfers within the contract or balance updates.

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