TRD is what the Rebels used in both DS battles.
The main weapons of Imperial Capital ships is the TurboLaser. now this is a great, and powerful weapon against large ships. The problem occuars when you use a large number of Fighter scale ships agaisnt it.
TRD takes in account of the inaccurate fire of the Turbolasers combared to other smaller ship based weapons. By flying close to the enemy ships hull, or surface. THe T-Lasers havea hard time tracking the fighters.
It makes it VERY difficult.. but not impossible. That is what happened to a fwe of the rebel piltos at Yavin. Hit by inaccurate T-laser fire, and went Boom.