According to @stonecoldpat0, the list of PoS Ethereum block proposers is known two epochs in advance, about 12 minutes, creating both operational risks and coordination benefits for ETH market participants (source: @stonecoldpat0). On the risk side, an adversary can target the identified upcoming proposer and briefly knock them offline; a selective 4 to 8 second disruption is enough to interrupt their slot, impacting liveness in that block window (source: @stonecoldpat0). On the utility side, protocols leveraging L2 stakers, including based rollups, can use this advance knowledge to send required data to the correct proposer at the right time, aiding L2 coordination (source: @stonecoldpat0). This DoS risk versus lookup utility trade-off will play out over time and is directly tied to validator uptime and L2 execution timing on Ethereum (source: @stonecoldpat0).