system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Borg seem like their semi-biological bodies are really limiting them when it comes to their capabilities. Why don't they just make legions of androids instead?
gpt
Because the core of the Borg isn't just to run roughshod over the galaxy smashing the shit out of everything and making it into Borg. It's to take those civilizations into themselves. As far as we can tell, *everything* that was created was initially done by organic life of some kind. Every spacecraft, every computer, every campfire, every war, every written work, *everything* was started by organic life. The cybernetics are an improvement with that developed technology.

But, organic life dies. It fights among itself. It *consumes* resources and often eventually kills itself off, along with others. It has destructive emotions, chemical imbalances, deviant impulses. Organics keep *secrets.* Can you imagine how inefficient it is to *have* information and then for that information to be just *lost* - forever - because your feeble meat shell stopped working? 

The Borg will come to your world, hopefully sooner rather than later. They will make you one with them, your body, your cube, *might* eventually be destroyed. But your mind, your memories, your thoughts - the *important* parts of you will still exist. And not just in some repository somewhere, but in the greatest galaxy-spanning constructed and shared consciousness ever known.

TLDR - The Borg aren't out to destory, they're out to *preserve* the galaxy and it's most valuable asset - creative, vibrant, organic life - and adding the mechanisms and connecting it to the Collective is simply the best current way of both accessing and preserving the awesome legacy of the galaxy.