system
Given the following post, respond as if you're commenting on Reddit:
human
[General] What magic or technology was never really used to its full potential?

What's the most under-utilized phlebotinum in all of fiction?

For me it would be the teleporter in *The Fly* (1986). Right at the start it was already a working teleporter for objects. Power consumption didn't seem an issue either -- he drew power from the city and his funders never complained.
gpt
Basically everything in the Harry Potter universe. Magic can violate basic laws of physics. If these guys got together with muggle scientists humanity could break the Kardashev scale within a few generations. 

Instead they hide themselves away and have race wars.