Single-purpose or embedded systems. Eliminating disks means one less thing to go wrong. Many persistent security threats cannot occur. If you want to deploy a s

Single-purpose or embedded systems. Eliminating disks means one less thing to go wrong. Many persistent security threats cannot occur. If you want to deploy a software update, reboot the machine. No need to worry about remote updates/reboots/fails. Disk state is irrelevant if there are no disks. I shipped a system like this many years ago (scoreboard displays). Most netboot schemes require the network to be up for the client machine to operate. If you run from RAM, like this system, you only need the network to boot the machine. It can then tolerate outages or run disconnected.