In Win10 Pro, you can postpone an update for max 35 days (windows update - advanced options - pause updates), but never indefinitely. If a pending update will break your machine (and you know because you already had to uninstall it), there's nothing you can do; it will install in five weeks no matter what. It's a timebomb.
Adding insult to injury is that these are primarily "feature" updates, and the features are for Microsoft's benefit. The April 2018 update enabled "Timeline" in the Task View (Win + Tab). All session activity is now shared with Microsoft by default. It must be disabled in Settings - Security & Privacy - Activity Sharing... so I disable all the new less-privacy things I don't want, and there are a lot of them... a week later, they are all switched on again, without notification or consent, after a subsequent Tuesday update.
And this is the reboot I can't postpone, on the OS I purchased. It's part Heller, part Kafka.