I guess they mostly apply to gamers, but then again it's an important aspect for every streamer. Gamers just tend to focus more on the game and think that no interaction is needed. IRL / music / etc streamers communicate with the viewers any way. I mean you yourself talked a lot in your stream. You can't really pull off an IRL stream without any talking so those kinds of streamers anyway follow those tips. :D

Streaming only from mobile makes things a bit harder, yeah since it is a lot harder to follow the chat. Hope fully we are able to make this a bit easier in the future too. : )

I've also heard that a lot of people nowadays are introverts. This might be actually caused by the popularity of computers. We type a lot, but we forget how to speak with voice or eventually are afraid to speak out loud. But if you have motivation this is trainable, as I said in the post. You just have to start and it will get better every day. : )