I think Arch and Gentoo are generally considered closer to upstream. So, it is less likely that you are getting os-specific advice on their wikis.

Worth noting that part of the reason the Arch wiki is more effective than the Debian wiki is that the former only deals with a single version of things, "current", whereas the Debian wiki has to address multiple releases. This makes it more difficult to prune old information or to have a concise narrative, among other effects.