The problem is essentially the same as with any other technology we've developed: it's evolving orders of magnitude more quickly than humans themselves are evolving, physically and socio-politically.
Physically and socio-politically?
I think you're implying that without the tech, future humans would be more adapted to better the consequences of tech. I call bullshit.
I don't know if we're much brainier than we were 5k years ago, but if we are, tech is what allowed us to put those precious nutrients and energy into brains instead of muscles.
Furthermore, tech is what allows us to "evolve" socio-politically. Without communications, you're hunter-gatherers who can sneakily backstab competitors without future consequences. Without nukes, it's viable (and possibly even sane, in a horrible evil way) to start a World War. Without tech, an otherwise perfectly admirable person gets sick and dies for no good reason. This goes on and on in so many nasty ways I don't wanna talk about.
The ensmallening(*) of the world is how we grow up. You might not like some of the directions it goes, but look where we're coming from.
We (humans) are not anywhere near ready to live in a world without borders
Maybe you're right, but you're casting it as though there's some progression where later, we might be ready. WTF are you talking about? Without tech you think we'll eventually become "wise beings of pure energy" from Star Trek or Babylon 5?
(*) Principle Skinner is telling me that's a cromulent word, so don't make fun of it.