Since when does a service pack have a specific means of deployment? A service pack can be whatever Microsoft wants it to be, from 2 updates, to a massive kernel upgrade. Regardless, the deployment method shifted with with Windows 8.1 because they started using system images (WIMBoot) not because there were too many changes. The images are easier to deploy, faster to deploy and use less space after deployment. It's also what allowed things like "Refresh PC" and "Windows to Go". All of Window's 10 deployments are the same way. And as far as you getting updates with 8, that's no different then any other version of Windows. 7, even without SP1, still gets updated. Vista/XP were the same way.