I need a game with four seperate and intertwined parts to it: FPS, RTS, flight simulator, and 4X, with Stellaris' customization style. You have your character, the one you make yourself and choose the skills of, and control in the FPS part of it. You can control them independent of others, doing intrinsic things like hacking a door or stealthing behind enemy lines, then once you have your job done you switch to the RTS and command all your squads or what have you to do their thing, likely having been fighting or holding position as you did this, and once they are doing whatever you can switch to an empire view, ordering around fleets between planets and battling for territory like resource rich asteroid fields etc. Obviously not always in that order, you could for example command a fleet battle, make a breach, land your guy and a squad on the surface to do a mission, spend a long time doing that, then finish the mission and retreat back to the fleet. There would be an AI for all your troops that is active for them while you're away, that'd play mostly passive/defensive without your commands. You could spend time making your empire's next battleship, or negotiating with a neutral shipyard to produce you 20 of their design, or talking with a travelling merchant to buy an old survey map he has of an old abandoned junkyard with a small fleet of cruisers to reactivate and renovate. Everything is customization by you, be it your ships, your troop's loadouts, your flag, the paintjob on your ships and bases, even how your men react to situations, for example you can have heavy weapons troops fall back to a defensive position while scout units harass from the sides, frigates make a defensive screen around battleships and let them cycle their weapons then move to let them fire, then close back up, etc.
Yes, I know, it'll never happen, and if anyone attempts a game with so many layers it'd be crap, but I can dream, can't I?