To provide a (small) counterpoint I've shipped code targeting standard mono for OS X, Windows, Linux, and MS's .Net compiler/runtime as source and distributable

To provide a (small) counterpoint I've shipped code targeting standard mono for OS X, Windows, Linux, and MS's .Net compiler/runtime as source and distributable DLLs and NancyFX based websites and haven't run into any major road blocks aside from minor Xamarin Studio/Visual Studio project file hiccups. Xamarin's .Net runtime/BCL compatibility list has been spot on for my usage. I can definitely see how chasing Apple, Microsoft, and Google's yearly mobile API revisions can be a task. I don't think that necessarily justifies throwing the entire project out (maybe just some careful evaluation of their mobile oriented offerings). It's akin to throwing all of Java out due to your displeasure with Android development (of which I have a long list of grievances).