Semi-automating the common cases with a GUI would probably help many of the less sophisticated users. E.g. scan the existing system for partitions and ask them

Semi-automating the common cases with a GUI would probably help many of the less sophisticated users. E.g. scan the existing system for partitions and ask them which one they want to repair. Windows' repair mechanisms also only work in the common case and you have resort to quite similar CLI stepss when they don't.