I agree with the part about people trying the game and then disappearing. I'm originally from Quebec, met a few guys that are there, friended them. They show up 1 or 2 weeks, then they disappear never to be seen again...
And speaking of the breathing universe, yes, there is the BGS. But I think the different state a system that can get into are not clarified enough. I know there is a boom state, civil war, a retreat, and a few others I forget because I see the states only in the galaxy map or when jumping to a system. I have no idea what the order of states are. I know how war can start between 2 minor factions but that's about it. And I'm sure I'm not the only one. Only people fully invested in BGS activities know what's going on. I think there are many parts of Elite Dangerous that are very hard to understand unless you decide to investigate them. Me? Investigating the BGS? It's actually not rewarding enough for me and way too time consuming. I will sometimes help my team in PowerPlay when they need to flip a system, start a war, but that's pretty much it.
So, there is a big part in this BGS but I bet it's still mysterious to many players.
Exploration could use a little help as well. 2.2 (or was it 2.1?) introduced geysers and fumaroles. I decided to make a longer trip part exploration and part passenger mission to the Black Treasure, a black hole a little bit over 5,000 ly away. Along the way, I was always scanning each system (while scooping) and surface scanning any planet that looked interesting. I was specially giving attention to planets that were reported with geyser activities. Never found one. Even with my surface scanner, there was nothing. After a few hundreds jumps, scoop, scan and then charge, it gets a little lonely. It's already a little boring to be in the same ship for 2 to 3 weeks, if we could at least find interesting things on our exploration trips, that would make exploration a lot more exciting. I'm not even mentioning that after a few hundreds scans, all planets more or less look the same. A high-metal one, a rocky one, an icy one, a few gas giants and a few ammonia-based worlds and, if you're lucky, maybe one Earth-liked. I guess that's what our galaxy is. I would just like to find some interesting features on those planets.