Star Trek: 10 Times Canon Got In The Way

The big, big thing with TNG's second season episode Q Who? is that it introduces viewers to the most formidable foe the Federation has ever faced; the Borg.

Or, does it?

Although the Hansens aren't responsible for mid-90s fleeting pop success, they are however responsible for one of the franchise's most wedge-driving canon headaches alongside Enterprise's Regeneration.

While the latter does get away with it because no-one has any idea who these creatures are as they flee Earth, the Hansens know before they head to the Delta Quadrant that they are seeking out the Borg. While their logs are only recovered by Seven from the wreckage of the Raven during Voyager, it's not a secret where they are heading or what the family is looking for. They have models of Borg ships, understand the nature of the Collective, and even follow a cube down a transwarp conduit.

This is sizeable research to have kept to themselves (if they did) and leaves viewers with the conundrum that Starfleet must have known about the Borg way before Q "introduced" Picard and his crew to the assimilation specialists. If that's the case, who specifically did know and why has this never come up since?