What is the least suitable technique to gather feature ideas from potential customers?

System archaeology is least suitable for gathering feature ideas from potential customers because it primarily focuses on analyzing existing systems and their components to understand their structure and interactions. This method is more about dissecting current systems than actively engaging with users to solicit their ideas or needs. In contrast, techniques like brainstorming and change of perspective directly facilitate idea generation from customers by encouraging creativity and divergent thinking. The analogy technique also fosters innovative thinking by drawing parallels from unrelated concepts, making these approaches much more aligned with the goal of gathering feature ideas from potential customers.