Star Citizen itself is my answer... I remember reading an article in Popular Science about it [0] when I was a kid, and specifically the sentence about "For example, designers modeled each ship’s landing gear to retract without interfering with the hydrogen fuel system that feeds the nuclear reactor." That sounded like the coolest thing ever.

So, now that I've gotten eight years older but still haven't seen the game release, it makes me kinda sad.

Relatedly, another PopSci article [1] promised that flying cars would be available by ~2015. That never happened either :-(

[0] I read it in print, but here's the online version: https://www.popsci.com/article/gadgets/space-game-gets-real/.