I have. There are a lot of people who do loose weight on high carb diets (actually, one of the points mentioned in Dr. Lustig's now famous Sugar: The Bitter Truth talk was that at the same time the Atkins diet was popular in the U.S., a high carb diet was popular in Japan, and both seemed to work fairly well, but they also both eliminated (non-glucose) sugars).
In any case, a lot of research that does compare the diets does show that both work to some extent and for some amount of time for weight loss. Everything else is up in the air, but in general there are ways to construct a high carb diet that does allow at least some people to loose weight and maintain that loss for some amount of time. But, similar to keto, it appears to be tricky and not at all like a SAD diet. Keto seems a lot better to me for a number of reasons, but the opposite seems like it can work, at least for specifically weight loss, for some amount of time.