We didn’t see Janeway look it up, so maybe it’s a Captain’s briefing thing (like Omega).
Which would mean the Borg would probably already know about the Genesis Device from assimilating Picard.
The minute they fired it up the Borg would detect it, know what it was, and already have adapted.
But we know that the Borg are constantly searching for advanced technology. Advanced technology that is assimilated from defeated civilizations by the Borg is used both defensively and offensively. Just imagine the Borg assimilating the Genesis Device and having the ability to reorganize matter biological matter at the subatomic level. The Borg would be able to create new shells of biological matter around their implants using Genesis nanoprobes. The new shell would give the Borg a layer of added protection against most forms of modern-day weapons. The Borg could even use the Genesis Device to re-grow lost shell material during combat that would add another layer of protection for the Borg.
When the Genesis Device was used as weapon, a cutting beam for example, the Borg could simply cut a hole in the saucer section of a starship and convert the material into base elements, almost instantaneously, that would then give the Borg the ability to add new sections to a Cube. Just imagine a Borg Cube cutting apart ships during combat, the material is reduced to the base elements and then used to add new armor to sections being attacked or increase the repair rate of damaged systems.
I would even go so far as to say that the Genesis Device could be tuned to cause cellular break down of a biological species during combat and then returned to the Borg using the Genesis Device process converted into a beam weapon. The bio-matter is then analyzed by the Borg, similar to a Borg implant inside of Picard's head. Instead of implants being needed, the Borg could fire the beam weapon at a biological from hundreds of yards away. The brain of the target is penetrated, the brain is turned to atomic data using the reverse process of the Genesis Device. Instead of constructing living matter from atoms, living matter is converted into based atoms. Information that is stored, based on how atoms create and store memories, is then collected from the targets brain using a data collection beam type of tractor beam. The information is then analyzed to give the Borg an advantage. Basically, the new Borg would be a Sniper Borg. The Sniper Borg would allow the Borg to not waste Drones during combat that would create a more efficient and lethal Borg solider overall.
I would even go so far as to say that the Borg would use the Genesis Device to deconstruct biological matter of an old Borg. The broken-down biological matter of the old bored, especially the memories of the Borg host, would then be stored in a data base, hidden very securely by the Borg. The non-brain biological matter would then be used to assemble new and fully grown Drones. Drones that might be the younger version of the Genesized older Drone or another Drone. The memories are reimplanted, and the Cube continues on its mission while gaining an efficiency value of not having to search for host bodies to replace aging Drones, thus the new programming of the Drone would include the aspect of being an Immortal as well as having always been a Borg and nothing else.
The Genesis Device would also give the Borg the ability to assimilate an entire planet and the life on the planet, entirely, to the very last atom of the planet, and then rebuild the planet, exactly the way the Borg needed the planet to be.
There are many advantages that the Genesis Device would serve the Borg which would make the Genesis Device one of the top technological advancements that the Borg ever assimilated. The Borg would be almost, unstoppable, if the Genesis Device was assimilated by the Hive.
What Is the Genesis Device - Bing video
2:41 of the video above;
should the Federation wish to fund these experiments to their
logical, conclusions.
It's obvious that Dr. Carol Marcus was not part of the Federation and that at some point, Vulcans were also behind the development of the Genesis Device. Dr. Carol Marcus is also the daughter of Alexander Marcus, a Section 31 operative.
Admiral Alexander Marcus (simply known as Alexander Marcus) is the secondary antagonist of the 2013 film Star Trek Into Darkness, along with Khan, and was the head of Starfleet and a leading member of the Starfleet black ops unit known as Section 31.
Could there have been a time operation involved with future knowledge of Vulcan and Romulus being destroyed, possibly a Red Angel incident, where Section 31 developed the Genesis Device in anticipation of both planets being destroyed so that Vulcans and Romulans that did survive, could easily be re-planted on planets that were created in the same likeness of Vulcan and Remus?
Dr. Marcus' development of the Genesis Device and Michael Burnhams, Holier Art Than Thou crusade to save the Federation, do both go hand in hand. Especially, given the fact that canon does link Dr. Marcus and Burnham to, Section 31.