Fleet log entries don't go away after you've discovered whatever they were about, making it hard to figure out which ones haven't been acted upon yet.
Yep, for the moment it's "how it works" but, yeah, less than ideal.
1: Auto-mark discoveries as 'important'.
2: Once the player has de-toggled that, let them fade out in a month or two.
3: Add an extra button to each such event that lets the player set, for example, "Never mark debris field discoveries as important" or "Never mark habitable planet discoveries as important."
- (Edit: Extra button like how expeditions have an extra button to let you avert them. This one's optional - it's points one and two above that are important for just being able to clear up the clutter - but would be a nice addition.)
4: Add discovery events from missions. If I see a mission like, "The Hegemony wants you to investigate a research station in system Foo", then - even if I don't take the mission for the Hegemony - I should get a map marker to help me remember that there's a research station in system Foo.
- (Edit: This one would work best in combination with 3, above; I don't need discovery events for "There is a barren planet in system Foo that someone wanted me to survey once upon a time", but I would want the game to remember places I know have, say, terran or terran-eccentric planets.)
5: Remove the arrows from discoveries. I don't care where I was when I got a discovery; that's not relevant information.
