Because there is a zoom out feature, use that to see where the enemy is coming from. Or one of the pop-up notifications saying a fleet is approaching. ( are there notification pop ups? I haven't played in about a week... )
I'll agree in multi system games it might be useful, then again you'd need to have your scroll bar focus on that system.
*EVIL EYES*
Yes, the zoom out feature is good, but if you want your focus on something else, like your main fleet that is about to attack one of my planets which have a my main fleet, you would be there all the time.
But at the same time someone else is about to attack on of your planets, you would need to know who it is, where it comes from, and how large the incomming fleet is.
So if you were able to just click a small icon at that planet and see the phase lanes connected to it, you will see where its comming from and how large a force it is.
Showing the phase lanes is a good idea in theory but I would probably get annoyed by the insane amount of lines representing phase lanes connecting everyone's planets. A typical icon would have 2-5 lines coming out of it. I would find this acceptable in very small scenarios, but it would be horrible to see in action on a large universe.
Ahh i see what you mean, its because you think it will be showable for every planet? well i think it should be clickable for each planet.
If you click it on 2 planets it should connect to just those 2, and show if the rute is between other another planet.
Like in the first image, if i would go from my capital planet to the yellows planet, it will take me 3 jumps to reach it.
So i get an idea what rute my fleet is gonna go.