It's because the hexbear/ml guys are grown up adults who are able to engage with different arguments and perspectives even when they come from people we disagree with. It's absolutely incredible how libs are utterly unable to step out of their echo chamber.
If you have any criticisms of the actual content of the article then feel free to share them. Sounds to me like you're projecting here being only able to engage with opinions that mirror your own. The fact that the only thing you care about whose opinion you're reading as opposed to the content of the opinion really does say volumes.