Lose track of inventory for a day and you'll feel it in the P&L before you feel it anywhere else. A SKU goes out of stock at 2am, nobody notices until the afternoon sync, and you've spent six hours driving paid traffic to a product page that converts zero. Same story on the ad side: a campaign's CAC doubles overnight, but your dashboard won't show it until tomorrow's refresh, so spend keeps flowing into a channel that's already underwater.