As you say, it’s subjective.
In my subjective opinion, the screen you prefer would be “not in keeping with the rest of the building”.
But, there is another alternative. There’s a new appliance they’ve invented recently called a clothes dryer. Not particularly “green”, but your clothes come out soft and fluffy, and nobody “snow-drops” your intimate apparel, or sees the holes in your undies.
If your missus doesn’t want to make the arduous journey up 10 floors in a lift, perhaps you could consider one of those?
And it saves the cost of electricity to run the lift.
If all the owners feel the same as you, maybe the OC could install a solar PV array on the flat roof in place of the clothes line array, to defray the cost and carbon emissions of the electricity.
And don’t blame the lady downstairs. It’s never who you think it is.