>The cost of a home has almost nothing to do with the materials.

In this environment? Citation needed. Building materials of all sorts are difficult to source, often with long lead times, and are multiples of what they were a few years ago. Labor has gone up as well. Builders are lucky to get 20% margins.

> In this environment?

It doesn't matter the environment, when we are talking about margins. Increased costs to the builder are passed along to the end customer.

> Labor has gone up as well.

Which makes any possible savings in materials contribute even more interesting as a way to increase the margin.

This is plainly and patently false. Materials are (more or less) fully half of the cost of building. If you use nonstandard materials that goes up because you need specialized labor in addition.