Based on the language ("the user") and the focus on the GUI, I think this OS is designed more for single-user workstations, rather than multi-user servers. This philosophy of "root by default" is also implemented by Puppy Linux, which was created by the same person.
Single-user workstations are usually pets, and it's much easier to manage a pet when every single unit of execution is separated from other units of execution.
It's also much easier to manage each application with it's own root for everything, rather than multiple applications installed into a single root.
