On the second point, nice one. My suggested point was to target 70% utilization which leaves enough liquidity of ETH for withdrawals and also incentivizes new ETH holders to come in to get good returns on their ETH holdings. On the liquidation side of stETH, thanks to Curve & Balancer which provides the swap of ~$1B at 1-2% slippage. So I think we can count on having enough liquidity in the market in case of liquidations between stETH <> ETH. Src - 1inch
Lastly, if in edge case the price slippage of stETH is 1% then that leaves an opportunity for arbitrage to leverage against and earn crazy returns. Eg:- let’s say with e-mode users can go up to 20x with stETH <> ETH. Then with 1% slippage users have the opportunity to earn straight 20% on their asset in a single transaction as 1stETH is always backed by 1ETH. Considering this we can assume that stETH will never go too low and e-mode will help strongly in stabilizing the oracle price.