You probably won't be writing kernels with it.
So what, so do Oberon, Modula-3 and many others including D.
Yet quite a few production OSes were even written with them, e.g. Native Oberon for the Ceres Workstation at ETHZ.
Pauses weren't an issue for users' productivity.
http://www.ocp.inf.ethz.ch/wiki/Documentation/Front
Video editor playing a video on the lower right corner.
http://www.ocp.inf.ethz.ch/wiki/Documentation/WindowManager?...
You probably won't be writing kernels with it.