Presently the trackball is displayed after a hold gesture. It will be a good addition to the features of the chart if the trackball can get displayed after a single tap.

Available in the R3 2018 SP release.

The VisibleRange property can hold the actual visible minimum and maximum of the axis while the chart is being zoomed and panned.

Series labels are not displayed for horizontal BarSeries in UWP.

Available in the 2018 R2 SP release.

When you have a Chart with PieSeries and enable the SelectionBehavior - selecting a specific value makes it split from the pie chart and stand out. We should consider exposing another state, where the integrity of the pie chart is not broken and the selected items are just highlighted or probably have a bold border, etc.

Add a title for the horizontal and vertical axis.

Available in the R3 2018 SP release.

If the series is added after the page constructor, the vertical axis labels are not shown.

As a workaround, create the series in the constructor and set its ItemsSource at a later stage.

Chart: The first label disappears when dragging over the chart on iOS

It is inconsistent with Android where the lines are not present and the background is transparent.

Workaround: 

<telerikChart:RadCartesianChart.Grid>
                <telerikChart:CartesianChartGrid x:Name="grid" StripLinesVisibility="None" />
</telerikChart:RadCartesianChart.Grid>

or:

chart.Grid = new CartesianChartGrid() { StripLinesVisibility = GridLineVisibility.None };

Available in the 2018 R2 SP release.

NSRangeException is thrown when second series has more items than the first one on iOS.

Available in the R3 2018 SP release.

Currently RadChart provides only a ScatterPointSeries which does not support categorical axes and you can only use a numerical one. 

LineSeries.Stroke and StrokeThickness are not applied when Palette is set

DateTimeContinuousAxis labels are off by one hour when device is in DST zone (Android).
Available in the R3 2017 release.