system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokémon] What prevents me from using my pokéballs to store people or objects?

It stands to reason that if the balls can safely store and retrieve all these weird-ass creatures made of rock, sludge and god knows what else then it should also work for people and objects. You also see Ash catch all these big-ass pokémon and as soon as they are inside the pokéball their weight is negated. He can carry a Snorlax and a Charizard on his belt without his pants falling down. 

So why are they underutilizing this awesome technology? 

* Your friend broke his leg while you two were hiking? Don't bother waiting for a rescue chopper. Just pokeball his ass and walk to the nearest hospital.

* Can't find parking? Put your car in a pokéball.

*  Terrorists have taken people hostage? Put a bunch of SWAT guys in pokéballs and chuck them on the roof so that they can quietly enter the building without alerting them.

I'm just scratching the surface here. I mean just think of what this would mean for the construction and shipping industries.
gpt
First of all, they are used for item storage. Why do you think items are always shown in them? And why can you carry all of them? Nesting.

There are a shitload of safeguards. Pokeballs (distinguished from Itemballs) only can work on Pokémon because it captures genetic specifics and elemental energy. We don't have that energy. Also, while there are some good uses for humanballs, that's more dangerous than any weapon.