Because the contracts are ephemeral and unverified we needed low level simulation tools to illustrate side effects.
It's a permissionless account primitive, anyone can build on it.
An ephemeral, counterfactual wallet primitive for cool hacker devs with certain desirable properties:
Smart: Runs arbitrary bytecode (only) when you interact with it.
Convenient: Instantly execute code on-chain without a separate deployment step.
Non-polluting: Leaves no state or code behind after it executes.
Stateless/Codeless: No code means no need to implement token receiver callbacks.
Safer: No code hanging around to hack.