system
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human
[Star Trek] The Borg don't develope their technology?

In the episode ''The Best of Both Worlds'' when Picard was captured, the Collective said to him they want to improve themselves. But through out the series, it seems The Borg only uses the assimilation and adaptive technologies at their disposal. So what's the point of assimilating all these technologies when they don't use them? Or do they?
gpt
They do use the tech they steal, but by the time they hit the Alpha Quadrant they were so well equipped that a lot of the stuff they pick up isn't really better than what they already have (or at least isn't good enough to justify significant modifications to their drones and ships in order to implement then). For instance, say a cube takes a Federation ship intact; none of the weapons or shields are really superior to the gear already on the cube, meaning the ship is more valuable as a source of raw material and information than it is as a tech source. The databases get copied, the crew gets assimilated, anything the Borg can use gets ripped out, and they move on.

But when they find something good? Yes, they take that tech, disseminate it through the Collective, and make the Borg collectively more dangerous. For instance, some species they assimilated way back in the day had adaptive shielding tech, so they stole it. Then, they found another species that could make that shield tech small enough to fit on individual drones, so they stole that and started upgrading the drones. This happened repeatedly, every time they took down a species, until they became the killing machines they are today.