Why was the Singularity removed?

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It left nothing for engineers to do once it was turned on, it'd just sit there being a big dumb photoshop cloud until it inevitably fucked the round up.

The containment field and lasers were cool though.

I don't want to have newbie engineers fucking everything up for everyone else, I want the engine to be more or less foolproof until you intentionally abuse it and push its limits.

It's trivially easy to capture deathgas from the engine and release it elsewhere. It's intentionally hard for the engine to do that by itself.

Honestly, these problems apply to the current engine as well. Setup is trivial, engineers have nothing to do when it's set up, abusing the engine and pushing its limits is actually easier and more effective than trying to run it properly, and a basic hellburn will fry half the station if allowed to run long enough without a shuttle call.