Hi AV
Off topic a bit.
On a drill rig or ship in 10,000 ft of water on DP station keeping with a tight watch circle, and the riser connected to the bedplate full of drilling mud circulating, with the riser tensioners providing heave compensation to keep the riser in tension and the drill string with the drill bit inside the riser another 10-15K ft below the below the seabed, yes operating the vessel with 5 engines in each engine room at close to full load with the bus-tie open may make sense.
In my experience, following extensive FMEA studies and trials they are operated with the bus tie closed (actually there are 2 bus ties for a ‘ring main’ configuration’) and the breakers are fast acting to split in microseconds in case of any fault.
KISS principle is best applied to merchant ships with 15-20 crew.