Here few useful aliases and mixins:

alias SolidColorBrush(key, color) 
{
  SolidColorBrush Key=$key
  {
    Color: $color
  }
}

alias Thickness(key, left, top, right, bottom) 
{
  Thickness Key=$key
  {
    Left: $left
    Top: $top
    Right: $right
    Bottom: $bottom
  }
}

mixin Size(width=none, height=none) for FrameworkElement
{
  Width: $width
  Height: $height

Right now only "Happy Path" is implemented for authentication. However auth flow is much more complicated: https://core.telegram.org/api/auth

Also authentication page lacks proper UX, validation, etc.

From oxyplot: oxyplot/oxyplot#1006

Since it will be a lot of work to maintain all these classes and examples/tests.
Keep the PlotView control of course.
Other XAML platforms (Xamarin.Forms, Silverlight) only implements the PlotView.

Вики очень лень писать, актуализировать - тем более

Стоит или делать это в рамках каждой отдельной фичи, или хотя бы в рамках релиза