I'm just someone who watches slippage every day, but every time the chain gets congested I want to complain: when you click "submit," the transaction is actually just thrown into the mempool to queue, similar to catching the subway during rush hour. A bunch of people are increasing their bids to cut in line (raising fees), if you don't add more, you'll just wait patiently; after a while, the price changes, the routing changes, and what could have been executed becomes a slippage explosion or fails outright, wasting some miner fees for nothing, which is quite costly. The most annoying are those who say "I've set 0.5%, why hasn't it executed yet"—truthfully, it's not that your setting isn't strict enough, but that your place in line has changed as the world changes. Recently, the social mining approach of "attention as mining" also feels similar to the mempool: those with louder voices get on first, while others squeeze and push from behind, and in the end, the costs are spread to the most impatient ones. Anyway, I now avoid activity during congestion; I’d rather miss out than become a slippage ATM.