I promise I'm not trying to be snarky or dismissive, but I literally have the opposite concern. I am amazed that a group of nerds on message boards can look at the most ambitious knowledge resource in the history of the Internet, and possibly in the history of the last 100 years, and come to the conclusion that it's urgently endangered by the fact that their edits about young startups and science fiction characters are rejected.
I feel like the Wikipedia project is one of the better run communities anywhere on the Internet, and that we don't perceive them that way mostly due to the absolutely spectacular scale that they operate at.
Note that I'm not saying they're the most pleasant community in the world to work with. They aren't! But that's because they're doing so much, working with so many people at so many different levels of engagement. Hacker News is a trifling community by comparison, and look how much work goes in to trying to maintain norms and civility here.
I feel like the Wikipedia community has bent over backwards to understand the concerns that completionist interest groups have about logging every possible startup, every open source developer of any note, every open source project, &c. They spend more time discussing their norms and processes about subject inclusion than any other meta-concern.
I do not feel like the tech community meets Wikipedia halfway. Every argument I see in HN threads about "deletionism" seems rooted in the idea that an Internet encyclopedia need not have strict standards for inclusion because the marginal cost of an additional article is zero. But that's simply a false statement; it's based on the false premise that the only cost for Wikipedia for articles is storage space. You can't read the Wikipedia project charter for 5 minutes without realizing that storage is their least important cost.