You are objectively wrong, you couldn’t be more wrong, you could try, but you would fail*.
Elite dangerous is a space / planetary simulator. So far we have plenty of space but very little in the way of planets ( or indeed living breathing spaces ). We need gas giants, thin atmospherics, ammonia worlds, fluffy clouds, coloured skies, weather, NPCs and vehicular movement. Then you can have your space legs, when there’s something in the game world to actually walk around**.
* Badly paraphrased from friends
** Personal opinion only
argument
So a variation of the old 'Elite is a space game, we don't need legs ' argument. Just because, in your words, ED is currently a 'space /planetary simulator' , it doesn't preclude the possibility of ED evolving into something with a wider scope.
We aren't short of landable planets, I haven't counted them personally, but they seem pretty common, so I would guess that we have billions of them in game. What we are short of is things to do on these planets. You've given us a list of planet types and mostly eye candy items, but haven't suggested any gameplay associated with them. Sure fluffy clouds will look cool, but then what?. The only things I've seen people suggest are fuel scooping and Bespin style cloud cities on gas giants. That's not a lot of gameplay, basically a variation on something we already have and a different station type. I'm still waiting for someone to suggest something interesting that we could do on a thin atmosphere or ammonia world that we can't do on the barren rocky and icy worlds. The only thing that atmospheres might bring is weather, which will either be, pretty, but irrelevant eye candy, or horrendously tricky to program.
I don't see why NPCs and vehicular movement would require the different planet types. The best place to start with them is in a relatively controlled environment like a city. These things are more part of space legs than atmospheric landing. Once you've got legs sorted out you can start to consider the possibility of landing on Earth like planets.
As for having nothing to walk around, I'm guessing you haven't thought about the space stations, mega ships and space ports. Admittedly you can't walk around them right now, but a single station has the potential to contain a map as big as the map of many other games