As far as I recall, the regulation only requires that locks be fitted, not that they be used. But the legislation does take care of situations where the landlord or rental agent never gets round to fitting them, or making sure they have been fitted, by passing the responsibility to strata schemes.
On the question of balustrades, the wire and post arrangement was probably in breach of local planning laws, largely because the owners could not guarantee that no child would ever be in the apartment unsupervised. And I recall a retired coucil inspector writing to us years ago to point out the planter boxes next to balustrades were illegal for exactly that reason.