so easiest fix would be to allow users to adjust the settings or disable them altogether. This ability is probably already built into the code as part of the tool set created for the art/development team, so it shouldn't be difficult.
We and you have no idea whether it's easy. It presumes your guess is correct. May be. May not. I suspect it is a postprocessing, cf Nvidia's FSAA. It's *straightforward* to do. Doesn't necessarily mean simple.
After all, colouring the hud is simple, but they've not done it under user control. I have no idea why. Maybe the same reason here. May be something entirely different.
But how should it be changed? What bits will change it in ways that "work". If it's a colour gamma, that's normal for many games. If it's saturation, again, like colour. Maybe it's contrast. But if we need to have 12 sliders to set the features of this postprocessing, we'll have 12 slider with only the cognoscenti knowing what they're doing. And even then only maybe.
And that is where I think the "not simple" lies. If they fiddled with 12 curves to get the current colouration scheme, then handing that to the users is just asking for trouble, making that not simple.
But if the system is not "solvable" with the colour correction everyone has for their monitor, then it's not as simple as you profess it to be.
But if the "solution" for those who don't like it is to have the entire postprocessing turned off (and you would need to see what that looks like to make the call), THAT may be simple. What may not be simple is that it could re-beige every planet or make the shadows look like the Grue is invading your cockpit.