A new supplier price list arrives as a PDF. Purchase prices on your products lag by weeks, so every margin is computed on stale cost. Which products are now sold at a loss.
Marketing launches a promotion and the warehouse finds out when orders spike. Why a promotion is not a demand signal in most systems, and what connecting it to stock changes.
Systems that cope all year fail together in the peak week, because people with time were holding them together. What breaks first, and what to settle before it arrives.
The same customer lives in the shop, the ERP and somebody's inbox, under three spellings. Each system knows a fragment and nobody holds the whole relationship.
Wholesale orders arrive as emails, spreadsheets, phone calls and handwritten lists. Software built around a checkout sees only part of that; someone retypes the rest.
Every system handles the order that goes smoothly. An order desk spends its day on the others, and those usually live in notes, emails and somebody's memory.
Purchase and selling price give you a margin. Shipping, fees, discounts, packing and returns decide what is left of it, and they arrive weeks later in other systems.
Five unsolved problems sit between a model that can shop and a machine that can buy. Most of what is announced today is a chatbot in front of a normal checkout.
Every system is designed around goods going out. Goods coming back touch stock, finance, the customer record and somebody's patience, and usually live in a spreadsheet.