Part of the context here is that UWP (universal windows platform), is a target to write-once and run on any windows platform situation. This made much more sen

Part of the context here is that UWP (universal windows platform), is a target to write-once and run on any windows platform situation. This made much more sense when Microsoft had multiple platforms running windows with just different sets of apis activated. At it's peak, this was: PC, phone, hololens, Xbox. SMS apis may only work on phone, spatial APIs may only work on hololens, printing may work on several, but not all targets. There are ways for developers to check which APIs are supported at runtime, but you can still call these APIs since they are part of the UWP surface.