system
Given the following post, respond as if you're commenting on Reddit:
human
[inception] Why doesn't Cobb's team give themselves the upper hand in dream heists?

They have almost unlimited creative potential in the dream, right? Why would they send themselves into a dream with small arms, going toe to toe in a shootout on the street? Why not give themselves a tank?
gpt
The more you affect a dream on a large scale, the more dangerous that the dream begins to 'push back'.

Sure, they could dream up a tank. Hell, they could dream up a sci-fi Invincitank. But that raises the risk of the dream kicking back; a small arms fight is just believable enough to the dreamer to avoid retaliation, but a tank is not.

This is what makes Cobb such a good dream thief: He can pull off robberies without needing to pull in exotic situations and imaginative weapons, leaving the victim with no intuition they were robbed (let alone risk of dream retaliation while he works).