The data points should allow setting shape and color to each one individually.

Provide the option to display text on arbitrary position - on the axis, on the data point, etc.

Currently the labels are always positioned at the corresponding datapoint

Currently the only way to apply different colors to the bars is through the ChartPalette. Provide an option to set the color according to the bound data item.  

Available in the 2018 R2 SP release.

When LabelFitMode is None,  "\n" is not taken into consideration.

Available in the 2018 R2 SP release.

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.

Available in the 2018 R2 SP release.

Add the ability to render points outside of the plot area when the data point value exceeds the explicitly set Min or Max values of the horizontal axis.

On Android and iOS, the line series will continue to extend off the plot area to a point that isn't rendered. Here's a screenshot, notice the line coming in from the left side of the plot area: https://www.telerik.com/clientsfiles/77e02115-6de0-4dd0-b572-5d5bc17a59b9_xamarin.jpg

On UWP, the beginning of the line series only starts on the first plot-able point. Here's a screenshot, notice the start of the line series: https://www.telerik.com/clientsfiles/d8c342e3-608b-40eb-95eb-8bd5e0dbc2e6_uwp.jpg 

Currently users could modify the visual appearance of the rendered axis labels, but cannot add a custom label at a specific location.

If you have BarSeries with CombineMode set to "Stack" with zero values, the bars are placed to the maximum of the y-axis. 
As a work-around, you would need to manually adjust the Maximum value of the vertical axis.

When added in page content dynamically  RadPieChart shows its original size correctly and then coerce to 200,200 size.