I hear you there. I have very little DWC experience myself. I tried it once like 10-years ago, and failed immediately, didn't even get thru the grow. I didn't do it right or try hard either tho.
The biggest problem I see with coco for growers is lack of proper drainage and feed schedules. Too many growers have their containers sitting on right on the floor, which makes salts accumulate at the bottom, as it can't fully drain. Plus coco does need runoff every time, and the "feed/water" idea which may work in soil, is a real bad idea in coco. I also find that with coco a lower EC is usually a good idea, compared to other hydro mediums where you would water more often.