Ian, An excellent point. Smith admired him, of course. There are similarities: photography as a second career, interest in documenting, the street sellers and so on. Even the fact that both men considered that they were making useful, rather than artistic work. Although much of Smith's subject matter remains, he and his wife feared that it would soon vanish under a tide of Modernist zeal. Perhaps he played his part in stemming that tide.
"More affinity" might be right.
Atget made weekly rounds of creative establishments, to sell his wares and I wonder about the effect of the conversations that he must have had, on his vision and output. I've seen no mention of this.