The problem is that once you make ordinary people competent in dealing with super people, you quickly reach "deconstruction of the genre" levels.

Not all supers are bulletproof. Nowhere near enough actually take that into account and it gets handwaved away for the plot.

Realistically, most good and badguys in marvel could actually be defeated by a wellarmed military unit or two. But of course if that gets teased, they suddenly pull out personal force fields or LMDs or whatever.

In the MCU specifically, how does the US Military not yet have a full unit of Pseudo-Iron Men by this phase? Whiplash and Hammer showed that people CAN reverse engineer Starks tech, with varying success. The military sure as shit collected every piece of armor scrap they could find from the big battle against "Mr. Extremis". No way they didnt piece at least one generally functiong suit together from that. Next, the Ultron units EACH had at least one arc reactor. No chance ALL of those got crushed beyond use.

All the drones Mysterio used? Very unlikely they didnt use arc reactors, very unlikely all of them get fully destroyed.

And so on.

Sure, Tony was a genius far ahead of his time. Sure, its Super Science. But thats the thing. It IS plausible Science in the MCU, not inexplicable magic. Science people mad at Tony managed to "fake" city destroying monsters that actively could destroy cities, seemingly with relative ease. Dont try to tell me the military could not get scientists intelligent enough to whip up pseudo AI to help run the refurbished Stark suits.

So, aside from "it would be horribly boring to have armies of Iron Men round up and defeat all super human threats" there really is no reason why the US military wouldnt already have functioning ArmorSoldiers on par with at least Iron Man 1 Tony.