Possibility to embed visible Alerts from 3rd party sites
The possibility to embed Streamlabs (and other) alerts when streaming thru the Twitch mobile client.
Embedded like a browser source, I would say 1 or 2 sources maximum (to keep in mind, it is still a mobile thing).
I think this will help to create a better experience on and with mobile, because the look and feel for the viewers - compared to a Desktop stream - is kinda similar and familiar.
Twitch already offers some options to use Streamlab components in Chat, why not extending the good experience in the Broadcast-part, too?
With a simple grid system...
1 - 2 - 3
4 - 5 - 6
7 - 8 - 9
... the Alert layer can be aligned, valid for Portrait and Landscape format of the phone.
I think that will encourage more Broadcasters to do IRL from abroad, because known elements are still used and visible - for the Broadcaster and their Viewers.