feat: update plan-b

docs/plan-b.md

@@ -2,7 +2,8 @@
 
 Timelocked Governance (TG) is a governance subsystem positioned between the Lido DAO, represented by the admin voting system (defaulting to Aragon's Voting), and the protocol contracts it manages. The TG subsystem helps protect users from malicious DAO proposals by allowing the **Emergency Activation Committee** to activate a long-lasting timelock on these proposals.
 
-> Note: Timelocked Governance can be considered a "lightweight" version of Dual Governance (DG). While TG offers fewer security guarantees compared to DG, it still significantly complicates governance capture attempts by malicious LDO holders.
+> Motivation: the upcoming upgrade of Pectra will introduce a new [withdrawal mechanism](https://eips.ethereum.org/EIPS/eip-7002) (EIP-7002), significantly affecting the operation of the Lido protocol. This enhancement will allow withdrawal queue contract to trigger withdrawals, introducing a new attack vector for the whole protocol. This poses a threat to stETH users, as governance capture (or malicious actions) could enable an upgrade to the withdrawal queue contract, resulting in the theft of user funds. Timelocked Governance in its turn provides security assurances through the implementation of guardians (emergency committees) that can halt malicious proposals and the implementation of the timelock to ensure users and committees have sufficient time to react to potential threats. 
+
 ## Navigation
 * [System overview](#system-overview)
 * [Proposal flow](#proposal-flow)