Upgraded my dual-booting laptop’s just-in-case-I-need-it install of Windows 10 to Windows 11, and despite my suspicions, it appears to have done so without messing up the rest of the computer! I suppose backing up everything carefully worked like taking an umbrella to ensure the day stays sunny…
Windows stays losing though, it’s surprisingly sluggish and slow to boot and shutdown compared to Arch with SDDM and Plasma.