Just paid my tuition again: I wanted to copy a small order on a certain L2, but in a rush, I used market price + default slippage. The depth was thin, and the execution price was pushed out a bit. Looking back at the blockchain, I was also sniped a few seconds later... Basically, I was too reckless with my order timing. I could have split it into two trades or placed a limit order first to probe the pool. Now everyone complains that validators/ordering services rely too heavily on MEV, and that fair ordering is a mystery. I can empathize, but I can't blame others—I've opened the door so wide myself. From now on, I’d rather spend a bit more time: first check the pool depth, lower the slippage, and if necessary, pay a little extra fee for faster confirmation—at least avoid getting caught by “random fills.” Anyway, for now, this is the way: being a bit slower is better than losing your temper.