While that's the theory, it hasn't actually worked in practice on most distros for many years -- rather than having "core stuff in root, extra stuff in /usr", w

While that's the theory, it hasn't actually worked in practice on most distros for many years -- rather than having "core stuff in root, extra stuff in /usr", we now have "core stuff in initrd, some extra stuff in root, different extra stuff in /usr, with different distros splitting the latter two up differently", the usr merge actually brings us back to the original clean design of having one "core" place and one "extras" place