He was restored from a V2 Horcrux that was too well-hidden: without the Resurrection Stone network (Horcrux V2.5?) he was dependent on someone touching his horcrux, which didn’t happen for a long time.
Well, as he said, it was an “obviously hidden” horcrux screaming “I’m apowerful magical artifact” (like the locket in book 6, which he explicitly calls out), as opposed to a random pebble in the middle of the desert.
He was restored from a V2 Horcrux that was too well-hidden: without the Resurrection Stone network (Horcrux V2.5?) he was dependent on someone touching his horcrux, which didn’t happen for a long time.
Well, as he said, it was an “obviously hidden” horcrux screaming “I’m apowerful magical artifact” (like the locket in book 6, which he explicitly calls out), as opposed to a random pebble in the middle of the desert.