I like letting the artist do their own thing. Let's say it's you doing the stream. I wouldn't want you to feel (lack of a better word) pressured to pay attention to one certain part of your drawing process. Cause when you're pressured, things don't turn out as normally as they would when you're not.
Not sure if my point is getting across, orz;
Just do your own thing, enjoy it, and pray that procaster doesn't decide to be a fuck up while you're streaming. xD
Though I do find that streams are most fun when the artist interacts with their viewers. It's amazing the conversations that manage to strike up.