EIP-7702 fundamentally changes EOAs by letting them carry and execute contract code. As a result, all legacy assumptions about EOAs are upended: checks like tx.origin == msg.sender or zero extcodesize no longer imply “true EOA” calls. Contracts that used these patterns for reentrancy or sandwich attack defenses can be bypassed, and token/ETH transfers to EOAs may trigger unexpected code execution. In practice, developers and security auditors must now treat delegated EOAs like contract accounts and remove any hardcoded EOA-only logic. In short, with account abstraction arriving, the Ethereum community must revise old trust assumptions and review smart contracts for these new risks.