The first wiki was intentionally of limited functionality so as to leave little room for the intended community of programmers to criticize implementation choices. Later generations have chosen otherwise.
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A wiki is a place on the internet where strangers can meet and make something of lasting value together.
The author's own feeling is that there has been a natural progression where community needs have been met with increased complexity but often just enough to satisfy without changing the traditions that make wiki attractive.
Omission: Some available history was soon added simply to correct accidental deletions. Wikipedia has found history indispensable for informed collaboration.
See Forsyth Criteria for agency in collaboration.
Overbuilding: Text formatting was judged to be an important enhancement over the plain text available then in email and net-news groups. I've come to believe that this feature just creates noise in the absence of meticulous copyediting.