What I would like to see is a Twitch App geared toward creators. I only have one monitor, but I do have an iPad that I use to monitor my chat. I would love to have an app I could use from Twitch to run ads, see my chat, and manage the channel while I'm live. It would be focused and aimed at creators and not so much content consumers. Also, I would love to be able to broadcast game content from mobile devices to Twitch without having to use Mobcrush or Omlet Arcade.
Streamlabs Has a mobile app that you can use for alot of the stuff but i agree it would be nice to have something more easily manageable (though i doubt many mobile devices would be able to run a stream well regardless of the software because they tend not to have powerful enough specs, just a friendly suggestion if you have powerful wifi you could try a ios screen recorder based on a lan connection, or if you want really good footage use a capture card, thats your real option for low latency high quality video with synced audio