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Because the Vulcans didn't think Humanity was ready. For this same reason, Vulcan withheld warp technologies that set the Warp Five project back decades. This is one of the major recurring plot points of Star Trek Enterprise.


One of the reasons why Archer was pissed off at the Vulcans was because they had dicked humanity around by withholding technology (except velcro, as depicted in "Carbon Creek").

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