In general the question for modders and players also doesn't have to be how to make everything as realistic as possible, that's not possible without the source codes of the game itself.

One should not aim for realism in every detail, but for a realistic difficulty in making certain decisions in this game. And if real time plotting information does achieve that, than it is a good thing, that's true.
It's just half of the fun for me, to use the estimated data on targets range an bearing to draw and plan intercept courses by myself where it is necessary.

The plotted passive sonar lines on the nav map are a nice thing, though. Because otherwise it is really hard to follow the passive contacts of 3 or more DDs circling over your head. And this is mainly because the sonar guy can track only one vessel at a time.