Hey man, if the main thing you remember about it is your guy was a double-rocket launcher carrying dude, and it actually [i]worked[/i], let's figure out why that WOULD work?

Maybe explosives and reactor technology have advanced to the point, along with armoring and defensive technologies, that rockets are the only viable weapon anymore? That'd actually be really cool. However, realistically, that'd also allow for other ultra-high-energy things. I could definitely see shit like Annihilator Iosa's energy shield from Iji: You'd basically NEED to hack it or something just to take it down for 10 seconds. That'd probably be military exclusive though, but my point still stands. Elite military guys and mercenaries could, if they have enough money or influence to throw around, have omega-shields.

Another thing, since reactors can IRL be rednecked to also be thrusters, (Search up 'thermal turbojet'. thatsmyfetish.jpg) and with likely advanced reactor technology, why wouldn't people have at least basic jetpacks and the like? I mean, that'd probably ruin what you guys were thinking, but that's a likely scenario in such a world. Another thing, if people have such massive amounts of energy to throw around, it's likely that the price of power has gone excessively low, and automation is now simply cheaper for companies and governments to use instead of people?

Anyway, that's what I currently have to throw around and discuss. It's all probably a bit stupid but I tried.