Here's what I think the entire Elite franchise is...
Elite was written to be a space flight simulator, the ability to see distant worlds, explore new places, and yes, shoot things. It was written in an era where games like Super Mario Bros where considered impressive (and to be released a year after Elite). It did sell, it sold well, but it was also a bit niche even for it's day.
Both the Frontier games where to follow up Elite, expand on it's universe, but be faithful to the original game. A note, people actually complained a lot about the change from arcade physics to inertial physics in one of the Frontier games, I forget which one. Flight Assist in Elite: Dangerous is to satisfy both groups, the fans of Newtonian and arcade physics.
As for Elite: Dangerous: I have a story which points out what I get from the game.
I lament loosing a good star system I found. There was a deep blue gas giant, around it was this rather rocky icy moon. That moon had very fun mountains and valleys to drive in... the view... oh man the view. That gas giant had a huge ring system that practically touched the moon, so you had this genuinely alien scene of the world nearly touching the ring that practically went on further than the planet the ring was surrounding. The sight was breathtaking, and sadly it's a sight I may never see again... for I forgot to record the system. I found the system before I used EDDiscovery, and the only recording I had was a twitch video that expired when I wanted to go back to it. This is... for me, one of the most beautiful sights I saw... and it is gone... I will never see it again... I don't remember which systems I went through to get there I don't remember any information about the system, just... it was an epic one. I was first to discover the system too. The system was was a procedural generated, and it will forever be a pleasant memory of an amazing sight and experience. Fortunately there are a few billion other examples of these left to find.
This to me, is the heart of what Elite should be, shining moments of amazing memories that stand out.
To me, it's not about the ship I fly, my ranks, or my combat/trade/exploration status nor should it be. To me, this game is about moments to cherish and sights to see, because ultimately I am still that child that'd look up into the night sky and say "I wish I could be there."
This, in my mind is one of a few types that can get the most out of Elite... those who can appreciate the game for what it is... not lament what it is not.
I admit, I'm not always in the mood for Elite: Dangerous, when that's the case, I'll walk away, do something else, and come back when my mood shifts back to the game. I play it because it is fun for me. I play it because it lets me do things I can't really do... I can escape the drudgery of everyone trying to be better than each other, ironically... because I can do things like point my ship in a direction, and just see... wonder.
I see Elite as a flight sim, set in space, with combat, and trade, and a galaxy worth seeing... that is what this game should be defined as, at least in my mind. With that in mind, I can get what I feel is the most of my time in it.
Elite, like any game, is there for having fun and to enjoy; To appreciate and experience for what it is.
To me, it's okay if Elite's not fun at times... I actually haven't logged in for nearly a month because I'm not in a mood for it specifically. When I have the urge, it will still be there, and I will come back to again and tell the child in me, "you are there".
I will concede that in terms of missions, activities and ways to play, it is still teething. But it is something I do enjoy sometimes, I don't expect it to be the be all and end all of gaming, no game should fit that description. I say this because there are many play styles, there are many ways to enjoy a game. There's nothing wrong with not enjoying a particular game, there's nothing wrong with not enjoying it. If you do, do enjoy it, if you don't... there's no monopoly on games out there.
I also enjoy Minecraft, Space Engineers, Fallout games, Portal, Antichamber, Papers Please, Starbound, the Borderlands series, Kerbal Space Program as well as many other games. Those games are all good for what they are. There are many things about all of them that I don't enjoy, or I tire of over time, and when I do, I put them down, and see what looks interesting in my library. Elite fills a void that was original filled with Eve Online for me. I have always gotten the most out of games that let me just have fun on my terms, and that's perhaps made me a bit bias, but when I don't enjoy something, I put it down for a bit, go to another task and then come back when I'm in the mood again. I do have several games I don't like playing, and that's okay too, they're there, sometimes they even say 'play this' and I'll say yes... sometimes I regret it, and sometimes I add it to my active rotation of games.
The lacks depth argument keeps being made, I am going to pull a very challenging game off the list and describe why it's challenging and what makes it simple.
Papers, Please! is about sitting in a booth, looking at documents and saying Accepted or Denied. There's a bit of detective work to work out which answer is best. But ultimately it is just a choice of Accepted or Denied. Sure there's a scoreboard where you're deciding if your family should get food, heat or medicine every day. There's a few stories, viewed from the immigration booth. George, the regular violator. Other cases where you have to balance your own family against the need of people going through the booth. There's a shooting mini-game that pops up once in a blue moon, but the game... at it's heart... is just a choice of Accepted or Denied. The depth is subtle though the depth is there.
Depth is incredibly arbitrary to define, so much so that it is a great way to throw out something that is otherwise interesting or even impressive. To me, the Halo and Half Life franchises lack depth, does that make them bad games, no... it does mean they're not for me.