A Borg resistance in Voyager was important
In the premiere of season seven of Star Trek: Voyager, Seven of Nine is reunited with a past love through a dream space, called Unimatrix Zero, that allows Borgs to return to their original consciousness before they were assimilated. Voyager helps some of those Borgs who were a part of the space to sever their connection with the Hive and regain their individuality.
Those unlinked drones commandeer a few Borg ships and start a rebel movement to fight the their former captors. The newly-revitalized individuals tell the crew of Voyager that they will keep in touch. And, as written in Looper, that’s the last we hear of them or from them which was disappointing, especially considering how the crew ended up having to face the Queen in the series finale.
The drones could have helped Voyager
These were drones that had spent time in the Hive like Seven of Nine, and they had formed their own group to fight the Borg from harming future planets. They had updated knowledge that even Seven didn’t have. And being in control of the ships gave them an advantage Voyager didn’t have, either. So it would have made perfect sense to have utilized the rebels in the final showdown with the Borg Queen. On top of that, those former drones could have used some assistance assimilating back into their former lives, much like the ship and crew did for Seven and she did for Icheb and the the others.
Unsurprisingly, none of that happened. The Borg was one of the biggest enemies Voyager had in the Delta Quadrant (some would say the Hirogen were just as bad), and any insight that could have been provided to the ship and crew by the liberated drones would have been beneficial. In the same way, the crew could have offered to help them find their way in the world after being connected to the Hive for so long.
Instead, the rebels disappear and apparently go fight the Borg in some other quadrant, forgetting all about their promise to stay in touch and any sense of duty they had to repay the HUGE debt they owed to the ship’s crew for their freedom.