there's a trope, common among other genres in superhero fiction, where a lone scientist or a corporation or such manage to come up with an invention that is way outside the usual tech level of their setting, and continues to be way outside the tech level. only one entity can make the super serum or mind control chip or laser gun or whatever. they don't mass produce it and nobody else independently discovers it, it's a thing they can do, not a thing their society can do.
and the thing that tickles at my brain is, it'd be interesting as a worldbuilding premise to keep the huge leaps in capabilities done by individual actors but get rid of the lack of replicability. start with a world like ours and say, ok, we're on the cusp of the mad science revolution, people are starting to come up with all sorts of previously-impossible technology, but once invented it's out there. every military has to adapt their doctrine to super soldier serum and laser guns. there's a cure for cancer and the protocol has to account for the one in a twenty chance it'll turn you into a werewolf. your neighbour moves in and she's made of metal and you're not sure if it's a full-body prosthetic or if in the last month when you stopped keeping up with the robotics news they made robots who are people. and it's definitely rude to ask. teleportation halfway across the planet is not cheap but like neither are planes and it does have a lower carbon footprint.
and like, it's not surprising why this doesn't happen by default, right. 'what would one guy being able to teleport mean in a world like ours' is a completely different kind of question to think about than 'how does teleportation reshape society, after accounting for the six other ways society has been reshaped in the past year'. it'd be hard to write. but it would be fun.