What difference does to make if someone is sitting on the bench, laying down, standing, crouching, or in any other comfortable resting position? It’s a public bench, to be used by the public however they see fit, as long as they’re not causing harm.

It’s weird to enforce the “correct” usage of a public bench, or the “correct” amount of space a person is allowed to take up, especially with such drastic elements that you yourself admit are not very effective.