> This problem is only an issue for those doing certain types of upgrades; it won’t occur with as-shipped Fusion setups. But it shows an inattention to detail w

> This problem is only an issue for those doing certain types of upgrades; it won’t occur with as-shipped Fusion setups. But it shows an inattention to detail with severe consequences— many users do modify their systems. So if you go way out of your way to DIY a Fusion Drive and set up all of the pieces required, it becomes Apple's fault when Disk Utility fails to acknowledge your heavy modifications? I wonder if the author gets mad that you can't move files out of /System and still expect the Mac to boot. After all, many users do move files.