These days, I've been staring at on-chain routing until my eyes blur, and the more I look, the more I think it's all about "sandwich + arbitrage." You think you're catching opportunities, but often you're just paying others' transaction fees and priority costs... I’ve also been there; at first, I got excited when I saw the price difference, but once I entered the pool and the slippage widened, my heart sank at the moment of execution: honestly, the profit you see might be the small cut others have already planned to take from you.

Especially around major public chain upgrades/maintenance, everyone is guessing whether the ecosystem will move, and when funds migrate, routing gets messier, traps become more frequent, and trading feels like driving in fog. Now I’ve learned to be smarter—prefer to do fewer trades than become "arbitrage material." For now, I’ll stop here and go review some failed trades and gas costs for the main trading pairs I use regularly.