Atmos, or The Air is On Fire.

[Clarks]

I like the idea of re-incorporating atmospherics in some way, but as far as I know it's a real mess of code to have to work with. It made the game lag and nobody really understood it, along with it being used primarily to grief everyone with gas. And it was never missed again.

This atmos system is local, which doesn't require to simulate tons of pipes that only carry gas around the station.
It requires extensive modification to release gases. This avoids plasma everywhere, every round, but gives traitors a way to gas a large area of the station.

I sincerely doubt that we'll ever have a proper atmospherics system again, but I also doubt that anyone thinks it is necessary anymore.

Maybe you don't like atmos, maybe you don't like fun.