One of my favorite sci-fi short stories, I would I could remember the title & author --
A man invents a machine that can grab a man from the future and bring him back to the present. He uses the machine, and it works!
He speaks with the man, and sure enough, the society he comes from is far more advanced. We didn't destroy ourselves or go back to the Stone Age. All right! So far so good.
He asks how far Medicine has progressed. "Well, we've cured all disease" the man from the future explained. "When someone is ill, we just hold this little shiny cube up to them, and it heals them!"
"Tell me about this device. How is it made? What principles does it make use of?"
"I don't know. That's something only specialists understand. I just know that it's shiny, a bit warm, and 3x3x3 inches.
And the conversation goes on like this, in other areas of science and technology: computers, communication, food production, warfare, etc.
Long story short, the man from the future is totally useless, he doesn't understand any of the technology his society uses every day, and is personally less advanced in the present time than the average "native" living in the 21st century, because Future Man is dependent on all those things (like the shiny cube) so he won't know anything about how to Do-It-Yourself when it comes to avoiding germs, avoiding illness, or treating illness.
Being also a science fiction and fantasy buff, I have started to look for this story. Would you know even roughly when this was written?
In many ways, we are indeed inferior to peoples of ages past. Heavens, technology has become an opiate of the masses on their assorted asses.
A snippet of a pop song from the late nineties; rather prescient
"See, it's a crazy world we're living in
And I just can't see that half of us immersed in sin
Is all we have to give these -
Futures made of virtual insanity now
Always seem to, be govern'd by this love we have
For useless, twisting, our new technology"