In one of my games I had to use popup control from device specific platform where I had to position the item under a text that is drawn using monogame.
What I saw is that if I ask from the native part of the application what is my screen size it will report [x:0,y:0,width:1024,height:768,scale:2] when I ask the viewPort inside the monogame it returns the retina result [x:0,y:0,width:2048,height:1536] and if you want to align the both alements you have to take into account that the dimentions in monogame are in retina pixels and the dimentions in the xamarin.ios are in points (non retina).
Isn’t that a issue of some kind it looks really smart just to return the non-retina size of the device and somewhere behind the scene just to convert into retina screen coordinates ?