Electric aeroplanes have electric motors, heaps of people complain about the noise from the electric hydraulic pump on the A320. I know at home my electric fridge, electric dishwasher, electric kettle, electric wash machine are not noise free.
I meant the continuous noise, i.e. airflow and turbine, not intermittent events like a pump going into action. And ANA uses a 2-4-2 configuration on long haul, so seat width was good.