Obtained my license in late 1950s, and chase dx 95% of available radio time, often with stations showing S-zero on my meter. Best estimate is I've made 500+ dx QSOs with S-zero stations. So, ANY interrogation method is vastly preferable to no interrogation, as long as it is very quick. One error some newbies make is the just listen method, but for thirty seconds to a minute. That is far from foolproof on HF. Propagation effects can and do deceive one into thinking a frequency is clear when it's busy. Occasionally there's a weak station in QSO, perhaps using long path, or perhaps whose sig is arriving at your QTH at a null in your antenna pattern. He's being copied by others, but not by you. In such cases, just listening may require five minutes or more, and few of us are that patient.