I also don't get what is so impressive about overwriting the MBR. This hardly even bricks the individual computer, just UEFI to boot from the network, re-image

I also don't get what is so impressive about overwriting the MBR. This hardly even bricks the individual computer, just UEFI to boot from the network, re-image the machine and restore the backup from literally hours ago after you know for sure you removed the malware from the image (or restore only non-executable data and use a clean image for the OS). What is the point of a cyberweapon like this that doesn't even persist itself on firmware?