An HOA (home owners associations) can say what color you can paint your house, What you can plant in your yard, What you can have in your driveway, and some even say what color your blinds can be.
Microsoft controls your computer, they say what info is sent back to Microsoft, and they say when you must upgrade. They can shut down your computer when they want whether you like it or not.
So far, and since I have been running Debian for a while now I don’t know about Ubuntu specifically, All the distros I have used either show an update is available, or you check for updates.
You have the choice and control to install the update and can do it later if now is not a good time. Or don’t install it at all, it’s your system.
Obviously, yes. My point is: Do you read and understand all changes in the code for each update? You need to trust the maintainers, cause they could theoretically push out any code with the update.