Funny you should post this as the other day while picking leaves of endive, we noticed a lovely ground beetle, quite small and black, and I hoped it would devour a slug before we finished! It didn’t but the endives are healthy and clear of any significant slug damage.
It does seem that not digging helps maintain a balance – which means less slugs, not no slugs – and no till farmers find the same, although it takes a year of transition after they stop ploughing for slug predators to recolonise the soil.