And one should:
1. Never, ever think about turning off the Windows Update service.
2. Realize, that with regard to Feature Updates which change the Version of Windows 10 that's running, they are not fully automatic in any meaningful sense anymore. You will be presented with the option to Download and install in the Windows Update Pane of Update & Security Settings. Unless you activate that link, the feature update will not apply. (Or at least it will not apply while the version that's on your machine remains in support. It's well-nigh impossible that one would not have triggered the download and install of the next feature update long before whatever one is using goes out of support 18 months after its introduction.)
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
The purpose of education is not to validate ignorance but to overcome it.