If such requirement ends up happening, I'd like to see exception allowing for shunt trip main and remote switch for fire fighters. If they have to cut a lock before operating the switch, so what, they have the ability to do that.

As far as spraying water on who knows what... direct stream is what has electrical continuity issues. To fight a fire direct stream is putting a lot of water in a small area, most of the time they are more likely to have wider mist pattern and not a direct stream, unless shooting the stream a long distance, but then allowing it to break up as it falls on it's target.