Don't just stare at the big APY of the yield aggregator... When I see it now, I immediately think: which contract is actually helping you "turn on the faucet" for this yield, and is there a counterparty in between opening and closing the valve? Contract permissions, upgradability, routing choices, are the funds being used for other collateralization circles—basically, these are all hidden costs. Recently, someone was complaining that validators are overfed and MEV ordering is unfair, right? Many times, aggregators are just packaging these "small temper tantrums of block space" into interest and sending it to you. You say, "Isn't that just earning passively?"... I can only reply with half a sentence: you can lie back and relax, just don't lie under someone else's bed.