Re: Temporal Cold War and the rest of Trek history
So how come Picard and co act like Starfleet has never encountered anything like the Borg in "Q Who?" ?
You can explain that by saying it was on a "need to know" basis. Until Q shot the Enterprise into the Delta Quadrant, Picard had "no need to know".
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)