I see what you mean, still, our design is inspired by the spinner functionality of the iOS Picker control - the popup shows a scrollable list of distinct values users can choose from and the selected item is vertically centered. This leads to the empty space when the selected item is the first one and the list is not set as looping, the same can be observed with Xamarin.Forms Picker on iOS:
In general, according to the iOS interface guidelines, such approach is suitable for medium-to-long lists of items. For shorter lists you can use our RadComboBox control which shows the items inside a dropdown.
The other option is to utilize RadTemplatedPicker control and and add a list of items (for example RadListView) inside its SelectorTemplate.
I hope I managed to address the concerns regarding RadListPicker. I remain at your disposal if any additional questions pop up.
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