The color text in Mass Effect goes a bit into the heat sink issue, in that the stealth systems on the Normandy couldn’t remain active indefinitely, since it would cook the occupants. Never comes up in game since flying the ship isn’t really a mechanic, it’s just a cutscene. Would have been neat to have a scene where everyone is slowly baking while hiding from the Reapers. Probably even got written and didn’t make the cut.