Battles between two hostile fleets had always been rare even during the golden age of warships. Space was too vast and ships moved at a snail's pace compared to the scale of an average star system. Though technology advanced and ships these days traversed a lot faster than their predecessors from the Age of Conquest, it was safe to say not a lot of battles actually took place.
The main reason why was because fleets often saw each other coming. Space was empty, so therefore an approaching enemy would always be spotted many hours before they actually arrived at their targets.
Accounting for the lag due to the speed of light needing time to travel from the outer system to the inner system couldn't be applied. A well-defended star system was littered with sensors that relayed their up-to-date readings to a hidden quantum entanglement node that instantly sent the observations to the inner system.
