Nobody should bring just ideas. Ideally a non-technical founder would bring whatever skills are required to guide the evolution of the idea. Engineers like to assume product-led growth guided by data, where the external human factors that determine success or failure can be explored in a BI tool, but there are a lot of B2B domains where engaging with customers to understand their business and understand their buying process, understand who buys the software and what their incentives are, is how you learn what to build.

Ideas are like currency: you can find them on both sides of the balance sheet.