Gregory Maxwell said:
Often the cost of finding a citation (if indeed one is available) for a particular point which is obvious to anyone who has studied the references, is just too great. As time goes on we will find more and more things where the material in the various wikiprojects is some of the highest quality material available, and we would have to ask ourselves, must we cite inferior information because of a silly policy when no one disputes what we would like to provide?
I'm sure we could both find examples where we'd both agree that a citation was either unnecessary or not worth compiling. I suspect that any meaningful examples would be rather contrived. Someone objected to the use of the word "evolved" in the article "centipede":
"...and jaw-like mandibles and other mouthparts that [[evolution|evolved]] from modified appendages." He edited it with the summary "no scientific evidence of evolution", removing this part: "and other mouthparts that [[evolution|evolved]] from modified appendages" I peremptorily reverted with the summary "this is not fundypedia", because diversification and specialization of such organs in arthropods has been well established for over a century. Should we cite down to this level? I think not, but mainly because we can link internally. The word "evolved" is linked to "evolution" and that article cites Darwin and Mayr, who (although the latter citation would probably make at least one acquaintance, an embryologist, wince and mutter about panadaptationism) seem to be adequate, as well as quite a lot of online resources. Thus scientific ideas can be presented in a Wiki without the need to annotate every sentence. In any case the interested reader can go to the Tree of Life project's entry on Chilopoda (an external link in the Centipede article) and find a host of references, including exhaustive examinations of the morphology, philogeny and evolution of centipedes, which are a particular example of diversification about the arthropod's characteristic modular bauplan of repeated segments whose characteristics, research strongly suggests, are controlled by gene expression.