> Apparently, Disk Utility and command line diskutil use different code paths. StorageKit does not appear as a direct dependency of diskutil. [snip] This duplication in what’s more or less the same functionality, while sometimes justified, certainly increases the opportunity for bugs.

To me this is the more problematic part - good design would use same code paths as much as possible for the GUI app and the command line one - the UI code in this case will differ but there should really be no need for diskutil and Disk Utility to use duplicate code for storage functions.