Not defending it, just... don't give a crap about it since I don't really look at it much. The first few times I play the game, I depend on this more since it shows which is time sensitive.
Normally I just glance through the journal and see which is active and then just look at my galaxy map and see if I miss a system to scan. I like that you only have to pull up the map to show which quest receiver that was still up.
So...because you use an online guide rather than the in-game system, the OP asking for an improved system should be mocked? Your play style is probably not very common, as people playing a game would rather have all the necessary information available in game rather than have to go online for a checklist. And how quickly does that checklist get uploaded once a new game comes out?
When there are multiple ambient dialogue side quests, it can be very hard to remember which one I've retrieved from the galaxy map and which I haven't. Especially since some of the planets aren't immediately available to scan when we receive the quest.
The ME3 was very basic and did not update at all based on our progress. It would have been helpful if, once we had scanned a planet and received the requested item, the journal changed to remind us which person on the Citadel needed it. Of course, I'd rather just not have these types of fetch quests in MEA at all....