Most people say "BI" when they mean "I made a dashboard in Looker Studio once." That's not ecommerce BI. That's a chart.

Ecommerce BI is the practice of pulling your sales, ad, and site data into one analytical layer that answers the same questions the same way, every time you ask. Not a one-off pull. Not a spreadsheet somebody rebuilds every Monday morning at 7am before the founder meeting. A structured, repeatable system.