

Think of the OS as a sum of hundreds of components. You have a kernel, a boot manager, a boot and service manager system, a shell, some command line utils, drivers, a display server, a graphical interface, a sound server etc.
On a classical OS, all these components are distributed individually as packages. Which means that there is a risk of failure at any update: discrepancies on dependencies or compiler versions, failed updates, power outages etc.
“Immutable”, also called “atomic” or “transactional” OSs, distribute the whole stack as a single image. If it reminds you of Docker, that’s because it’s exactly the same thing. An update can’t fail. It’s either fully applied or not at all. And that’s because it’s not an update at all, it’s a complete system image deployed alongside the one currently in use. If it doesn’t work, you can simply “downgrade” by selecting the previous image.

Oh man WipEout 2097 was such a musical revelation and the soundtrack of my teenage years! I still love to this day The Prodigy, the Chemical Brothers or Orbital