Just now I was looking at my transaction queue in the mempool again, and I really feel the helplessness of squeezing into the subway during peak hours... You think clicking send is the end of it, but actually it gets "temporarily stored" by a bunch of nodes first, miners/validators pick and pack them, and if the gas is too low, it just stays there. If it stays too long, it might be replaced by someone else with the same nonce, or you might have to pay more and resend. What's more annoying is that during congestion, you can also get targeted by front-runners. Clearly just trying to swap tokens, but when you open up the slippage too much, it feels like you're writing "Come and exploit me" right on your face. Recently, the staking/sharing security model has been called a "scam," I can understand: the more layers stacked on the chain, the more you have to figure out which layer you're stuck in when something really goes wrong... Anyway, my current principle is still that old saying: survive first, then talk about profits.