system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why didn't​ the Borg stay in warp and skip over Wolf 359 to go straight to Earth?

It seems like it was an unnecessary risk to stay and fight.
gpt
The Borg value efficiency. Fighting and destroying the federation's fleet is absolutely in their ability but they know they're not invulnerable. 

So it is a lot more efficient to destroy the federation's response to their invasion before beginning their assimilation of Earth. 

They can focus on one thing at a time. Much more efficient. 

Also, breaking the morale of earth would enhance and make their process more efficient.