We often see valuable discoveries come from some area that was previously overlooked. There's not enough there to demand any sort of cute phrase but just enough to discourage the notion that a society with some advancements over another has nothing to learn from the other either.
Vernor Vinge's A Deepness in the Sky depicts a human interstellar civilization thousands of years in the future, in which superluminal travel is impossible (for the humans), so travelers use hibernation to pass the decades while their ships travel between star systems. Merchants often revisit systems after a century or two, so see great changes in each visit.
The merchants repeatedly find that once smart dust (tiny swarms of nanomachines) are developed, governments inevitably use them for ubiquitous surveillance, which inevitably causes societal collapse. <https://blog.regehr.org/archives/255>
It reminds you of Clarke's third law, "Any sufficiently advanced technology is indistinguishable from magic." I still remember the ominous feeling of receiving an unsolicited, location-based mobile notification from Google requesting a review immediately after leaving a local restaurant. Digital surveillance works by some unseen "magic" to most users, which is more dread than horror, like a hacker posting your IP and location out of nowhere just to freak you out.