Exherbo is the singular item on that list which does not use ebuilds; the lack of progress and technical stagnation of Gentoo is what led to the Exherbo founder

Exherbo is the singular item on that list which does not use ebuilds; the lack of progress and technical stagnation of Gentoo is what led to the Exherbo founders starting their own distribution and develop a new package format. The package formats have diverged greatly to deliver important features (such as this one, among many others) Gentoo was unwilling or incapable of delivering. It's unlikely changes like these would ever be introduced in Gentoo, for multiple technical and more importantly social reasons. Gentoo has a big problem with accepting sound technical ideas because they come from politically incorrect people.