Option A) Everyone shares one OS (container, sandbox, kernel, firewall, whatever). It gets a lot of eyes on it to find bugs. Hacker fuzzes it with a lot of tokens offline. He finds one exploitable vulnerability and he owns everyone.

Option Z) Everyone vibe codes their own custom OS. Each implements and exposes only what they want. Hacker has to beat up on it online to find vulnerabilities. He finds one and he only owns that one machine.

There's probably some middle ground between A and Z, but monocultures are fragile. All eggs in one basket, potato famines, banana fungus, etc...