I went to MS forums for remembering how to write "sfc /scannow", "Dism /Online /Cleanup-Image /CheckHealth", because it was often the first answer on a post. How-To's concerning "bootrec" and "diskpart" were always to be found somewhere else. At least with sfc and dism it was always pray and hope it does something useful under the hood.

With an unbootable Linux partition (which seldomly happens) I mount it, chroot it and then have a plethora of fixes I can try, tools I can use and logfiles I can check instead of putting my self in the hands of 2-3 blackbox-apps. Manual fixing under Windows is possible but nobody can tell me it's feasible with the repair console.