If it’s your os drive that dies, nothing important has been lost except for a few minutes of work. You can boot from a variety of media (cd, usb…) for recovery, or drive replacement. Worst case, you’ll have to reinstall a few things in the following days.
It’s also why it’s not a bad idea to separate the various aspects of the system on distinct drives.
Besides, Plasma can look like anything else anyway, so why switch?