GNU/Linux does "Fashion" Robotics

I'd not paid much attention to the Japanese "fashion" robot, until I came across this:

Japan's National Institute of Advanced Industrial Science and Technology (AIST) has demonstrated a Linux-based humanoid robot that will perform in a fashion show next week. The HRP-4C runs the robotics-focused hard real-time ART-Linux distro, which was released this week for Linux 2.6xx under GPL.

The HRP-4C robot and the open-source ART-Linux distro (see more farther below) were developed by AIST's Human Robotics Group (HRG). ART (Advanced Real-Time) Linux has been used in a variety of humanoid robot prototypes from the Japanese government-backed HRG/AIST, says the group. The newest HRP-4C model announced earlier this week has been a hit on YouTube (see below). Designed to look like a young Japanese woman, the robot stands (and walks) about five feet, two inches (158 centimeters), and weighs about 95 pounds (43 kilograms).

Inevitable, really: why would you use anything else?