My theory on Q and the Borg is simple. The Borg tested the federation and the Romulans and couldn't be bothered with them. But that star drive they witnessed in Q-Who was something the hell worth assimilating which they mistook for a newly invented human technology. You saw Seven talk about their process in attempting to assimilate Omega, they went to the bother of assimilating low tech, even preindustrial, worlds just beccause they had minor information pertaining to their distant goal in their verbal history.
Picard is the worst pet ever.
Picard is the worst pet ever.