No feature updates are just that. They add new features. Most of the features are kind of cool things. Like the Windows Sandbox feature in 1903 is basically a mini VM for opening sketchy stuff. Don't expect any game changers. There's a reason why Windows 10 is the "last" version of Windows. People are pretty happy with what they have and aren't really looking to upgrade.
By disabling feature updates, you just get security updates and bug fixes.
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