Something Americans don’t know about is that streets were shared spaces between pedestrians, cars, bikes, everything. Then cars got a bigger role and pushed everyone else to sidewalks. Then bars and restaurants also wanted part of that space for outdoor serving. Now pedestrians, bikes, bars/restaurants, bus stops, e-scooters and parking spaces, advertising signs, and trees share the side walk, which in turn has become much more narrow because of car lanes…
97% of the time, the average car just sits in the parking space, taking up space not being used.
I guess you can say something similar applied to balconies. They are probably being used, but only a small portion of the day.