I hear what you are saying, but we can reduce the differences between build systems while still using different targets. I do a lot of work with OpenEmbedded,

I hear what you are saying, but we can reduce the differences between build systems while still using different targets. I do a lot of work with OpenEmbedded, every distro image you create is for a different hardware platform, using different libraries, different tools, etc. But it is a unified build system. So I can say use this version of glibc and spit out the files in that folder, and with very minor tweaks I can use a completely different version of glibc and a different file structure for another image. If we had a unified dependency/build system across distros, we could have completely different contents while having relatively straightforward customization because if you knew one system, you'd know them all.