As a developer how can I target an application for correct external display support when the majority of iPad Pros only support a gimped version of an external display? External display support was clunky from the beginning, the fact you can not output an aspect ratio other then the Native ratio of the iPad itself is asinine.
As a developer you should know there are several iPad apps that have full screen output to an external monitor when connected with a cable or using AirPlay. It's been supported for years on an app by app basis in several games and image/video editing apps.