Not to defend ED here, but some people really seem have put their expectations for space sim genre way too high. Technically it is all possible, but not at once, not without huge costs, and not without considerable compromises to make it even look like something regular people would want to play around with on regular basis. I personally felt NMS had a chance to be nice little game which actually bigger depth than ED because of single player nature - before hype, high expectations, and HG own marketing game destroyed it all. They are still games, they aren't full sims and most likely never will be. It is just too much for any company to handle, and really won't work together. If you wonder why ED moves so slowly with tweaking and changing features, that's why.
I think Star Citizen is culmination of this 'imagine this as a game' culture and fitting end to all of it. It will be healthy for genre imho, especially because not only ED exists, but NMS and tons of other, smaller space games, all looking for their own unique angle (Everspace, e.g.) and delivering it in spades. As for ED adding space legs yes, GTA in space is kinda possible (while still having strict set of actions possible), but requires very forward thinking team with long term goals. Either FD, or someone else will do that eventually. I just don't see CIG being able to pull that off.