I'm speaking of entertainment value. It's informative, and can be entertaining at times, but it's not professional streamer quality.I'm not nitpicking. I completely disagree with your assessment that a commercial games studio running streams from a manned and fully fitted studio could be considered to be not professional. And you can tell the difference now they have returned to the studio.
And no, they are not professional streamer. There job is CM. It's what they are paid for. They are, indeed, professional CM.
OA is a professional youtuber. He doesn't do a CM job. He does a good job at youtubing. That's why he gets more views.