Use Mobile Data For: Settings - Why does Settings need a cellular data connection?

iPhone 5 iOS 8.1
Settings > Mobile > Use Mobile Data For: Settings
Just curious, why does the iPhone need this turned on? Why does the settings app need a cellular mobile data connection?
If you turn it off, you're pestered to turn it on every time you go into settings?

Because, that's the way Siri works...it needs an Internet connection...requests are sent to Apple's servers. No Internet, no Siri.

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