I'd settle for Chromecast support. There is an unofficial app, BTW.

i just sideloader spotify on my shield tv and control it with mouse or connect in spotify on my phone, since they cant even add chromecast support i dont think they will ever make app for android tv

To those who have side loaded apps/games, are you experiencing that a lot of stuff basically work perfect as is or are there issues coming up that you wouldn't expect? Loving my Shield so far but it's a little disappointing to see games that I paid good money for or will pay good money for now since they now have a little leeway to justify higher price tags if they're selling you something "cross-platform" (looking at you Square Enix).