Pretty weird how little they use the physical keyboard in the demo. I'd expect for at least their own apps / launcher, you could navigate with WASD. Instead, they're switching between tabs by clicking on the very top of the screen while the phone is on a table, which is very much not one-handed mode.

There's a better video here which describes a text-based interface: https://www.youtube.com/watch?v=ryFV1wHD8FM

Why did they make those security settings global?

I'd want different containers (sandboxes), depending on the things I'm doing.