I have never seen a company so good at breaking functional OS installs with updates.
After installing any new version of Windows, all PC users get used to having a small percentage of Windows Updates fail to install. As time goes on, 'update rot' causes an increasing percentage of updates to fail, always for some reason the user knows nothing about. Windows Update even has a 'hide this update' feature intended to prevent endless attempts to install a failed update.
Eventually, update rot on some PCs eventually turns into total update death, in which every boot of the system begins with the message "Installing Windows Updates..." You have to watch the machine grind through half an hour of installing the same series of updates that all fail, followed by restore from a pre-update restore point. This is generally when the user starts budgeting for a Mac to replace the cursed thing.