I don’t find gaming stressful at all, I just honestly don’t have the time for it. Gaming means my butt needs to be in the chair doing nothing other than playing the game. Watching/listening means I can be doing dishes, folding laundry, or even commuting to work. Very rarely am I totally focused on watching/listening to someone playing a game, and I’m never involved in the chat.

If I had the time, I wouldn’t watch nearly as much, but I don’t, so watching is my surrogate.