Recently, everyone has been arguing again about which L2 has higher TPS, lower costs, and more aggressive subsidies.

I'm actually more concerned about a fundamental but critical issue: who holds the power to order transactions.
In simple terms, MEV is just front-running on the chain; some think it's just arbitrageurs snatching from each other, but in reality, it often affects ordinary users—
you think you're executing at the price you see, but you get front-run, and the slippage becomes your tuition fee.

I used to believe that "on-chain transparency = fairness," but I later realized that transparency only makes front-running easier to calculate.
The real challenge is: who queues transactions, how they are ordered, and whether anyone can arbitrarily change the sequence.
From a macro perspective, the hotter the demand for settlement layers, the greater the space for front-running, and arguing over parameters is pointless.

What I’ve learned isn’t techniques, but that: don’t blindly believe that "faster and cheaper" equals more fair.