[UWP] Skipping setting "default values" for element properties in renderers is problematic

https://github.com/xamarin/Xamarin.Forms/blob/ee91ac443941133a9163c62787d831ad16aaa156/Xamarin.Forms.Platform.UAP/ButtonRenderer.cs#L58

Is checking of default values really necessary in renderers?:

If ... Element.Padding != Button.PaddingProperty.DefaultValue ... UpdatePadding();

The default padding value for a Xamarin button is (0,0,0,0), while the default padding for a UWP button is (8,4,8,4). (https://msdn.microsoft.com/en-us/library/windows/apps/mt299109.aspx)

This means that if I set padding (0,0,0,0) on a Xamarin button, and I really want it to be (0,0,0,0) on UWP, the renderer will skip setting the padding property. And my UWP button will have a (8,4,8,4) padding, which is not my intent!

Does checking and skipping default property values in renderers have any meaningful purpose? It seems to me that it creates more problems than it solves.