The influence of Vulcan primarily affected Ves. Whatever power flowed to the other Journeymen only gave them a fraction of the boost.
Yet this relatively minor change granted the female mech designers another perspective that was mainly based around craftsmanship.
How Vulcan perceived the quality and the intrinsic nature of objects was radically different from that of any human. Though Alexandria's design network wasn't able to convey much of this, what little it managed to pass on was enough to open their eyes.
The most important impact of this change on them was that they became faintly aware of certain higher-level variables that were normally out of reach for mech designers at their level.