Currently, UI elements like icons of station turrets or mission points can be very invasive, sometimes filling the screen. What can be done to make this more user-friendly/diegetic?

It's something that they're interested in looking at, but they're not sure how soon they're going to get to it. What they want is some sort of intelligent system that works based on how far away things are, based on a priority that the designers have somehow set, which then works out which things to show and how many of them to show - i.e. choosing which options from a massive selection are the most important to show. This would be the starting point to addressing the issue.