Read Leviathan Falls and then tell me it's boring. The Expanse novels are chock full of real science. AND they introduce an initially inexplicable tech that over the course of the nine novels is plausibly explained. They could do it in ED. There are tons of great SF writers out there. Just need the will.
nobody said it had to all be magic. Just like all advanced tech isn't mind boggling in how it works.
The difference between "hard" sci fi and everything else that's sci-fi though is that hard sci fi doesn't have anything not rooted in the science we know now. And everything else is just a sliding scale of how feasible or fantastic you're willing to suspend disbelief for.
When it comes to games and space, you almost always have to deal with the vastness of it in an unrealistic way. Even Expanse handwaviums away the g forces needed to accelerate so that travelling around space doesn't take realistic amounts of time that would kill any story. Not as much handwavium as star trek ...but still.
And elite is well outside of the hard sci fi realm. The only thing hard sci fi about it is what the stellar forge tries to base it's procedural generation off of ...but everything built in top of that tech demo is fantasy. The limitations therein are arbitrary and often inconsistent with any kind of hard sci fi intent. Instead, they're chosen out of gameplay design choice or they were chosen out of necessity because at the time there was no other option and changing it now is seen as disruptive.
if the thought process with an idea in elite dangerous is "But that's not realistic" - you're not judging it properly...because elite dangerous doesn't care about realistic. It only needs to be judged on whether or not it would fit the aesthetics of the game and improve gameplay. How real it is only matters in the context of fitting in with the feel of the game. Nothing more. Even fitting in with the lore is only a very soft consideration.