Ironically, we can run into competing interests here. The NEC isn't the only factor at work.
I don't see too many balconies that are not part of high-rise, high density housing. Over the years, I've encountered all manner of leases that stipulated "NO laundry" and I wouldn't be the least bit surprised to hear a landlord object to a balcony being used for anything at all.
As you might guess, such landlords are not about to put in receptacles to frustrate their policies. Places are deliberately designed this way, and for that reason. Why else are there so many places where the only thermostat is in the boiler room?
As the NEC gets into 'design,' it leaves the arena of safety and enters the realm of social engineering.
