There's no way ED is a simulation. To mention just a few points:
Faster-than-light travel.
"Hyperspace".
No relativistic effects.
Frame shift drive, apparently compressing the space in a whole system, while being unnoticed by all the inhabitants.
A few tons of fuel getting from one system to another.
A top speed in normal space.
Gatling guns on spaceships (yay, steampunk!)
Instant refuelling.
Non-material shields stopping solid objects.
Spaceships carrying armour.
Random elements having unexpected uses for randomly improving the performance of ship components.
... etc.
So it's a game, one among many. The only reason to play it is if it's a good game; I happen to think it is.
ED has a lot of simulation in it, and, in many cases, real science to it (which goes hand in hand with the simulation parts), even if some of that is still on the fiction side of things.
*Milky way (a theoretical simulation of our entire galaxy) = Science + Simulation
*All bodies in the galaxy have orbits, rotation and produce gravity wells = Science + Simulation
*Landable planets have simulated gravity = Science + Simulation
*Most actions in the game, affects the BGS = Game mechanics / Activities that feeds the Simulation of system states (Boom, War, Civil War, Election, Lockdown, etc).
*Large Starports are rotating to create artificial gravity = Science
Of course, it needs to be a fun game as well. So the FSD is certanly one of the more gamey aspects of it, or... lets call it Sci-fi... the simplified "Flight Assist ON" is clearly a game mechanic to make it a bit more fun and allow for an "easy" mode when traveling in normal space.
Yes, what you mentioned are certanly aspects of ED that makes it a fun game, but... it is also has a lot of simulation and science in it.