Someone asked me why a seemingly simple swap can go wrong... Honestly, it's just because I was careless: I set the slippage too "optimistically," and the depth was just thin enough. Then I insisted on finishing it all at once, giving the bot a polished sandwich. Looking back, my order placement rhythm was way more reckless than I thought: breaking it into smaller parts, waiting two or three blocks, checking if the pool suddenly got drained — that’s actually more stable. Recently, those new L1/L2s are trying to incentivize and boost TVL; the pools look lively on the surface, but once it’s time to "mine, transfer, sell," the depth can vanish as quickly as emotions, just gone... I now prefer to go slower, earn less, but I don’t want to be someone else’s liquidity lesson again.