The regular streams are merely a tool to interact with them and kill time between major events. If you want to saviorfag some random 2view, you only get the filler and never the major events. If you go for other big chuubas outside Holo, then you also get the events, but in turn there will be a shitload of other chuubas you should be familiar with to enjoy said events to the fullest.
It's already hard as fuck to keep up with Holos, imagine if I started adding to that. If anything, I'm thinking about which Holos to drop because it's too much already. I'll stick with my oshi, collabs involving her, and clips/songs/3D streams of the others just to be familiar enough to get the most from the big SPWN concerts.
I don't watch gaming streams for their own sake, I watch gaming streams to support my oshi while she works on her next actually cool project.
When will some 2view twitch EN chuuba have a concert at Toyosu PT? Suichan will have one next month. With her full album coming out at the end of this month.
Here are some of the great songs and MVs she was able to release by investing the shitton of money she makes into it (one of the instances where, contrary to popular belief, numbers ARE quality):
https://www.youtube.com/playlist?list=PLAo9RlHR2tDZwddeEyp9nTfpaFB58DrXdBut hey, at least you can watch your twitch chuuba playing whatever shitty game you could be playing yourself instead that Holos don't have permission to stream. Have fun!