Cloud Based Browser Studio like Lightstream because...
I primarily have been streaming Mixer because of the built in capabilities via my console. However rather then heavyweight programs like streamlabs, obs, etc.. that drain you of valuable network resources I stream my mixer feed to "Lightstream" and then can apply overlays, and third party extensions via that.
Twitch needs to design and implement a system such as this one e.g. "Cloud Based" thru the browser that will open the gateway for console streamers to do professional streams on Twitch without need all the useless BS such as streamlabs and obs and such. Make it simple, allow people to send their twitch feed into the cloud based streaming studio apply their overlays and extensions and then display that new source from their on twitch with all their modifications to it.
This is exactly what mixer does with lightstream for the xbox one streamers and console streamers and it allows the masses to quickly and seamlessly go live with a professional overlay and not all the **** software.

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CDCardBoardGames commented
It would be nice for twitch to have something like this that is free to use. It would make console streaming alot nicer. I feel you I stream off xbox one had to use some weird extensions to get that feel.