What Microsoft is doing here is splitting Windows Update in two. The normal "check for updates" button will now only function for security and monthly patches. Feature updates now get their own area in Windows Update where the user can initiate the download and install process for the latest feature update available. If the user doesn't want to initiate that process, they don't have to. The user will be alerted that a new feature update is available every now and then, but at no point will the user be forced to install that update, as long as the version of Windows 10 they're currently running is still in support.