Uh what version of Windows repair did you use???
The Microsoft tier 2 technician that first used Windows Repair, while my PC was still Windows 7 Pro, used version 3.3.0.1 that he downloaded on 8/6/2015. It was 3.3.0.1 that fixed a 8007005 Windows Update error that wouldn't allow me to download Windows 10 or even use a Windows 10 Pro install DVD to upgrade my PC. I'm not sure what it fixed, but after running Windows Repair I was able to upgrade my PC to Windows 10 Pro.
The version that I used on Windows 10 Pro, after I restored my HD from the backup taken on 8/7/2015, was version 3.4.0.3. The reason I ran Windows Repair again was that Windows 10, after the restore, was reporting an 0x8024402f error while trying to manually invoke Windows Update. Windows Repair did not fix this problem but after days of trying various fixes and running various scans, Windows update simply started working on it's own. There's been speculation that Microsoft simply put something in place that blocked all updates to Windows 10 users until they could complete there most recent cumulative update that was made available on the 28th. One side benefit of running Windows Repair again on the 8/26 was that it did fix another problem.
After I upgraded to Windows 10, each time I would perform a cold boot, the screen would display the Windows 10 splash screen and then the screen would go completely black for 16 second or more before it would display the Login screen. I thought it was a bad video driver as my graphics card is 6 years old and AMD has not produced a driver update for it in 3 years. I was about to go out and spend $200 on a new card but after running Windows Repair 3.4.0.3 the black screen only shows up for 1 second or less. Again, I'm not sure what Windows Repair fixed but I'm very happy with the results.
My primary concern now is keeping my system health and what I was wondering was whether forum members frequently run Windows Repair just to verify that no problems have crept into their systems or whether they only run it if they know that there's a problem. If they do run Windows Repair frequently, how frequently is it used?