> With a decentralized exchange, your transactions happen within a matter of minutes and your only exposure to any potential failure is during those minutes.

I thought many DXes operated by people effectively parking tokens in them for long periods of time so that others can come by and trade for those tokens (otherwise you'd need a way to sync up people who want to trade). The credits received for parked tokens can be redeemed for any token at the exchange, but during the possibly extended period of time you're holding a credit instead of holding a token, you can lose it all if the DX is compromised.