There is so much tech the heroes have access tech (antigrav, amazingly efficient energy, all sorts of medical treatments) to that could change the world. And I mean in the day-to-day sense of the civilian world, not military activity. Some of them are ones that appropriately made difficult or impossible to commercialize - alien-created, very rare components, killed the creator, etc. But others seem cheap enough for a non-wealthy person to invent and and build and wouldn't be difficult to market and make a fortune with. And some have even been in governmental hands (especially when they catch the villains that use them), but they never make it to the general population, because then the DC world would be way too different than our world.
Anyway, I was just curious as to which technology you think being made public would make the most positive sort of difference in the world.
I actually got started thinking on this when reading an early post-COIE bit on Karen Beecher Duncan and it said her antennae had solar panel endings and that was the power source and I started to think of the implications of that surface area generating enough power for a person to fly (and appropriately battery tech existing) and it being affordable enough for her to build when she did. And that tech being introduced all those years ago. Then I just starting thinking about how many others there were. And the effect of lowering emissions and climate change and so forth. Talk about reshaping the world. And the impact on geopolitics...not all positive.