Wiki-lawyering (citing policies in purposefully cryptic and usually erroneous ways) is rampant, and all these problems exists because admins aren't appointed due to domain expertise (or any sort of expertise for that matter) but being in the good graces of other admins. This conflicts with most wiki content editors, who are often domain experts rather than bureaucrats/politicians. I ended up being banned for doing a reasonably popular reddit AMA about all this, and apparently violating the rule to never talk about wiki administrating outside of wiki.
In sum, the system only works because talented and intelligent people want to create encyclopedic material, and there generally aren't enough admins to stymy this.