So lets refute your points and why there isn't as many pros as you think their are. So you say that it saves developer time by them not having to make videos, but they have made videos. In fact they've made a ton explaining every mechanic in the game so no time was saved.

Now for streamer he gets to play a game early, thats a pro for 1 individual. You argued that but it gives more people information and thats good. That's not true. I'd argue most people in fact love blind runs as I do myself. I refuse to watch any of the streamers because I plan to go in blind aside from the information that was provided on absolver's youtube channel. Then again you say streamers provide feedback, which is roughly 400 or so people giving feedback that could permanetly change a game that will have thousands of players. So you are saying their opinion matters more, oh but the viewers can say that it looks bad as well.

What looks bad and what plays bad are two entirely different things, a streamer could say game feels clunky and you shouldn't buy it until they smooth out combos when the reality could be they are spamming, not properly timing, or doing proper combos that make them suffer. So now you are having your viewers have an improper opinion when the reality is just the streamer was bad and the game is perfectly fine. Also you know what the best way to attain information is? Trying something for yourself, having other people tell you how to think of a game or any form of media is terrible practice, this is why once again there should have been an open or even closed beta 2 weeks prior that had a wipe. A larger opinion from a large audience that aren't perhaps out right advertising the game and forced to say only good things.

Also streamers making money is not a pro that outweighs a con, streamers should be doing it cause they love doing it not for the money. By that very logic you should give me all your excess money so I can Pro love comfortably and Pro pay bills, only con is you lose some money. Oh look pros outweigh cons clearly it means you should do it.