A controversial notion.
Much has been made of the difference between ThreadMode and DocumentMode, and between signed and unsigned discussion. While there is little controversy regarding whose opinion explicitly signed content represents (it's the opinion of the author - this includes use of DramaticIdentities as well as RealNames), there is some question regarding whose opinion (if any) that unsigned content represents - especially DocumentMode.
A couple of possibilities.
Obviously, different unsigned contributions may be treated differently. Unsigned inline comments have generally been treated like AnonymousCoward posts; and pose little difficulty. DocumentMode (or stuff that looks like DocumentMode) is regarded by some to be VoiceOfTheWiki.
The essential problem is that some users advocate that posts which are VoiceOfTheWiki (or are likely to be construed as such) should be subject to higher standards than mere "opinion" posts. It is argued that any statement made in VoiceOfTheWiki mode should:
Others disagree that the VoiceOfTheWiki exists; and see no reason why unsigned pages/comments expressing any OnTopic opinion should be disallowed. To these users, Wiki is a discussion forum, not an online reference - folks seeking authoritative pronouncements on any matter are better off to consult the relevant literature. In addition, some believe that a key value of Wiki is as a forum for dissenting opinions, a type of opinion that VoiceOfTheWiki tends to act against. In addition, the site has long held a preference for EgolessWiki. Unsigned content is good, not because it represents a claim to (unearned) authority, but because it represents a donation of the content to the Wiki. By not signing, the author implicitly gives permission for others to ReFactor his/her words, until it does represent a de-facto community consensus. (In which case it might be useful to distinguish unsigned content which has been extensively ReFactored? by the community, from unsigned content which hasn't been and is newly-posted. The current Wiki software doesn't make that easy). [It should be noted that the author of this page, who has chosen not to sign it; offers this page to the community in this manner. The content of VoiceOfTheWiki, as it sits today, should not (yet) be considered VoiceOfTheWiki. If that doesn't confuse old NormanTheAndroid, I don't know what will.]
Finally, WardCunningham has an interesting take on this issue on the page AnonymousOnPurpose.
A third position is that VoiceOfTheWiki exists, but is not conferred upon a page merely by virtue of being presented in unsigned DocumentMode style. Instead, it only is conferred upon a page when it truly does represent a community consensus - when other WikiZens have read the page, commented on it, ReFactored? it, until a consensus is arrived at by the process of constant revision and critique, much as a river creates a waterfall by slowly carving the streambed. Attempts to engage in VoiceOfTheWikiImpersonation? are doomed to fail, as one cannot manufacture consensus. (Unfortunately, to the new reader who hasn't been here a while, it is often difficult to tell the difference).
"Others" find Neutral Point of View quite sick, and having to constantly reads "others argue" and "others disagree" to be utterly repulsive.
It seems that there is a simple solution, which the participants in the current EditWar are ignoring. (OK, it's not so simple, because one person's ReFactoring is another person's desecration...but):
Should the content of this page not be on VoiceOfWiki? -- EarleMartin
Maybe, though that page deals with the "tone" of conversations here; whereas this page deals with the authority (if any) that should be inferred in unsigned contributions.
Perhaps it should be renamed SoundOfWiki?. -- EarleMartin