Key Points:

While immutability is important for ensuring security and trust, there are scenarios where the ability to upgrade a contract is desirable, such as:

• Bug Fixes: Fixing vulnerabilities or logical flaws in the contract.
• New Features: Adding new functionality or features.
• Optimizations: Improving performance or reducing costs.

Without upgradability, once deployed, a smart contract is effectively "set in stone."

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This is in stark contrast with Solana, where contracts are upgradable by default, and can be forced to be immutable by updating the update authority

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