It occured to me that with the new lock rules measuring while locking is now an intended feature of this mechanic as you may first measure any number of objects (asteroids, mines, ships) and then choose one. As one range is 2 1/2 base length you can now „peek“ around and check your next move/maneuver. Vader can (ab-)use this by himself. Imagine Vader in position to take a shoot. He wants to lock (to trigger Adv. Targeting Computer and FCS) but maybe can also barrel roll out of arc of the defender in direction of an obstacle. It seems with RAW and RAI he can now „check“ (there is still room for misjudgement with the range ruler) with his target lock (by measuring both „targets“) first if he can do the barrel roll then take it or save one force.
Other pilots can at least glimpse distances for the next round planing their maneuvers ahead or need coordinate.
Seems like a little „buff“ to the target lock action.