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There are speculations that Windows Update itself could be broken: http://www.computerworld.com/article/3170633/microsoft-windows/windows-update-issues-may-be-

• acqq 10y ago
  I've followed the links. The argument "if the patch is broken on, for example, Windows 10 but not on Windows 7 they could still release for Windows 7" is wrong: once the patches for Windows 7 are available every criminal can investigate them and then apply the results to the unpatched (delayed) 10 systems. So it's either all platforms or none. Now they distribute all patches in one month together, so they possibly limited themselves to "all or nothing" also for one platform. But regarding all platforms, they only had the choice of releasing all platforms delayed: e.g. one or two weeks or the whole month. If the issue is not trivial, as probably isn't, the whole month alternative wins.