Why do you think there such a difference in the way starships are piloted in the movies? For example, in TWOK, a big production is made about the only Z-axis movement the Enterprise makes in the whole movie. In the nebula at the end, Kirk stops the ship and orders, "z minus ten-thousand meters, stand-by photon torpedoes." A rather big deal, considering in Nemesis, during the combat scenes, several ships are shown on various vectors, obviously useing all three axies. In DS9, in multiple episodes, the Defiant displays simply incredible manouvering abilities.
I was thinking as time went on and technology developed, somehow ships became easier to control at sublight speeds. This could be used to explain why drones got phased out as a weapon system, and possibly why transporter bombs became ineffective.
Any thoughts?
Oh and one other question. What speed is considered full impulse?
Thanks!