Benefits to crossed pathways with the motor/sensory cortex?

Question

Why are the pathways from the sensory/motor cortex crossed (left half of the brain controls the right half of the body). What is the benefit to this archetecture?

Answer 1

I don't think there's any functional benefit that we can easily understand, other than allowing instructors to write confusing find-the-lesion test questions for students lol

Answer 2

I thought friends with benefits included sex and sexual intimacy.... If what I'm thinking is true, then no line is crossed. It's when you go around acting like he's your boyfriend and get all snotty when he starts talking to another girl that you've crossed the line.