Good point. But, apart from cost of the gas, mentioned by sibling comment, that also isn't disruption-free. Gas-based systems are by definition (they displace o

Good point. But, apart from cost of the gas, mentioned by sibling comment, that also isn't disruption-free. Gas-based systems are by definition (they displace oxygen) dangerous to humans. But yeah, not being able to run maintenance is orders of magnitude less problematic.