As others have noted, BSG specifically has internal story logic which explains why there isn't AI all over the place on the human side. However, more generally, AIs slugging it out, probably over great distances, over timeframes that would probably be very different (both quick and slow) from a human dogfight probably wouldn't be very interesting to viewers relative to essentially WWII dogfights in space.

(And, in general, some version of WWII combat (plus lasers, etc.) is still the model for most SF--even when it's not very deliberately aping it as in the case of Star Wars.