As a kernel programmer I find it so lame that when people say "Operating Systems" what they're thinking is just the superficial layer: GUI interfaces, Desktop Managers and UX in general. As if the only things that could have OS were desktop computers, laptops, tablets and smartphones.

What about more specialized devices? e-readers, wifi-routers, smartwatches (hey, hello open sourced PebbleOS), all sorts of RTOS based things, etc? Isn't anything interesting happening there?