Why Windows 11 installs updates automatically?

You can disable the auto update and install the update manually.

Go to Settings -> Windows update. From there, you can disable auto install updates or pause the update.

1.Security: Automatic updates ensure that the operating system is regularly patched to protect against vulnerabilities and security threats. These updates can fix critical security flaws that could be exploited by malicious software or cyberattacks.

2.Stability and Performance: Updates often include improvements to system performance and bug fixes. By automatically installing updates, Microsoft helps ensure that all users have the most stable and efficient version of the operating system.

Updates are essential to keep your system secure and up-to-date with latest features. Updates also fix known issues.

Since Win11, it is a must to have an internet connection now while in OOBE which starts to check updates, although it can be bypassed by some ways, but normal users may not know.

Type gpedit.msc in Run, then go to Computer Configuration > Administrative Templates > Windows Components > Windows Update > Manage end user experience > Configure Automatic Updates.

When you're done, open PowerShell and type "gpupdate /force" to stop the automatical update.