I need to dig out my copy of '09 and check, but I don't recall there being many shots with two ships fighting each other on screen at the same time.
I know they did do it, especially the Kelvin scenes, but I don't think they did it often. It's not a far step from what they did to not showing ships side by side at all.
I have to come down on the side of the lazy production accusation. There are ways to do action and relate to the audience what is happening without Star Wars space battles.