How can you dogfood a product if the product itself isn’t ready for production use yet but its idea changes the fundamentals of how you work and hence develop.

How can you dogfood a product if the product itself isn’t ready for production use yet but its idea changes the fundamentals of how you work and hence develop. It would be similar to criticizing the first ever bridge builders that they don’t use their own yet under-construction bridge for constructing that bridge, and instead transport their construction materials on water.