They want to promote their game, the more they promote it the more it might generate revenue. Thus, allowing them to get closer to gold and move on.
I'm sad that I didn't get on the bug testing team, but meh, I've seen enough of A19 through the Dev streams to know that I want to play it. And will most likely be like you and avoid watching the youtubers play.
I was laughing so hard during the the stream where Lathan, Joel and Richard were playing coop, that my wife had to come check on me. Thanks to Lathan, I'll probably try a fort / brawler build, something I would have never considered doing before as I'm more of a agi / stealth build guy.
But this way they have people with a large amount of followers promoting the updated product and it will hopefully generate sales, and more interest in the game.
Am I happy about it either? Not really, but I'll wait til Monday, then will be playing it myself hopefully. Cheers and happy Monday to the rest of us when it gets here.