I’ve watched some here and there, but having to try to catch them when they stream has put me too much in the mind of old tv and catching shows when they air. Watching the recording afterward is maybe good for some white noise, but it’s clearly not the intended experience I think.
I was a pretty heavy Twitch user for a while, even streamed for a couple years myself. The biggest draw for me was the community. Most of the time I couldn’t care less what the person was playing, I was there to interact with them and their communities. It was about the only social/entertainment outlet I had at the time.