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Underrated feature in games: Fake desktops/PDAs.
(sh.itjust.works)
Bonus points if they are super retro ideas of the future internet like in front mission 3.
Something I continually think about is how Doom 3 showed us a world where you can have a first-person game that seamlessly has you controlling a mouse cursor on in-world computer screens, and it saddens me that nobody picked up that baton.
Best feature in that whole game.
I think it has to do with the feature not working as seamlessly with controllers - or at least developers believing so anyway. The original Xbox port of Doom 3 had the camera zoom in to a panel where you were near it and IIRC the BFG edition has the controller slow down a bit in some panels.
There are a couple of FPS games that had similar in-game UIs, though they aren't as big profile as Doom 3. I bought Exodus from the Earth some time recently and the game has a lot of in-game UIs that use a similar seamless control.