Are you saying it is not terrible that pathfinding does not do any prediction for where the target they're headed for is going to be considering their speed?
For the vast majority of the game, it doesn't matter. Your ships move so much faster than the planets that you're not really losing much by direct chase. For the portion where it does matter (extremely slow, conventionally-engined commercial vessels in the early game), you can work around it by placing waypoints. That's what you have to do when trying to intercept enemy task groups, and I haven't heard anyone complain about having to manually work out those intercepts. In fact, that's a major part of games like this.
While it would be nice if the game predicted planetary positions and moved toward those, in most cases, it just doesn't matter. So I wouldn't call it "terrible," so much as "inconvenient." If you have an alternative implementation ready to go, why not submit to the Pulsar 4x group? The base functionality of Aurora is unlikely to be changed, especially in marginal cases like this.