That is true...however from what I have experienced with my plants..you will be dangerously inviting the possibility of fungal or bacterial infection, depending on how cool the nights are. So what I do is to water early in the morning directly on the root zone only, before the sun hits my plants. As I understand it the stomates are closed for sure on the leaves, but the established plants, those roots are still taking in moisture. It helps cool down the roots, before the hot blazing sun comes about, and by night time, as the media is still moist, then it can fully take up more that it needs.
Consideration too on the location where you are growing your succulents, whether indoors or outdoors. Indoors, it takes much longer time to dry out, so watering in the evening for me is a big no-no.
Also have to consider what type of leaf the succulent has..like the Adeniums, Plumerias and some Euphorbias, they have thinner leaves, not the succulent type, but they have caudex or some thicker stems..these plants will surely like to be treated as tropicals, so water in the day is needed.
