well UWP and Windows store have those baby flaws still but in it’s evolving more to support like you publish your game to steam and get xbox live support too and cross-platform easy way. and is still in devkit phase so more is coming and March 30th is Microsoft Build conference so we will see more from there. in UWP you could focus the app for specific platforms still or have platform specific code. also it’s big in scale too what Microsoft try to complish and keep Windows as open as possible