Most agencies own a slice. The TikTok agency doesn't see your Amazon listing performance. Your Amazon manager doesn't know what's going viral on TikTok. Your Shopify CRO consultant doesn't see either.
We see all of it. Same team, same dashboards, same weekly review. When a TikTok video starts converting at 4×, we know to push that creative into Amazon Sponsored Brands and Shopify paid social — that same week. When Amazon shows a SKU running hot in Texas, we ramp creator seeding for that geo.
That's what "one engine" means in practice. One team. One dataset. One P&L view.