Agreed. Coreboot would be especially useful for things like laptops. I would love to be able to use coreboot on my laptop if I knew how to set it up and not risk bricking it.
Laptops have a chip for handling flashing, battery charging, keyboard, trackpad and other related features. This chip is often undocumented witch makes it difficult if not impossible to get CoreBoot working on a Laptop. That being said ChromeBooks are using CoreBoot afaik.