Recently browsing on-chain records, I keep seeing a bunch of "arbitrage" screenshots, and the comment section is full of "opportunities are here."

I actually tend to get anxious easily: you think you're picking up money, but it might just be the bread for a sandwich, and once slippage opens up, someone slips in, and the fees and spread are gone...
To put it simply, sometimes what you see as an opportunity, others see as the exploitable margin in your order.

I'm more the type to first calculate costs and failure probabilities, rather than impulsively chasing hot trends and swapping.
Especially now with all the fuss about NFT royalties—creators want income, but the market complains about liquidity being locked—ultimately, it comes down to the old question of "who pays for the friction."
Anyway, I now try to split my orders into smaller parts and avoid chasing prices up, preferring to go slow rather than become someone else's fee source.