I guess the biggest gap for me is windows mobile getting up to speed on the react-native stuff. In Android / Ios I can have a roughly working app in a couple days, but getting a project to the same place on windows mobile has been a bit more of a hassle. Some basic notes related to this:
1. Windows tutorials lacking for your example apps: https://github.com/ReactWindows/react-native-windows/tree/ed... (I would do a pull request myself to fix it if I had time these days)
2. These example apps should all work with the run-windows command "out-of-the-box"
3. Some simple native plugins would be great (e.g. a "windows hello" react-native module is something I would have to write if I were to make a windows mobile version of my current project)
4*. Possibly too much to ask for, but for android / ios the emulator works standalone (e.g. without xcode / android studio), in windows, I seem to need full visual studio running, which doesn't sound too bad, but beside photoshop / onenote / some other things, can make things a bit slow on a pro 2.
Unrelated, but maybe a prettier version of something like template 10? (Another project I would do myself if I had time) Comparatively, the ios / material built-in themes tend to feel much less clunky..