In most new events (I only know about this from golf) they only get given 2 medals (one for each gender) as a probation run and they just get told to make the best of it. Presumably the climbing authorities thought they had to showcase themselves in a certain way in order to get established and be given more medals in the future. I know in the case of golf that is why they basically use the most boring, safe format available.
All these weird mixed relays in various sports seem to be a way of gerrymandering gender equality in terms of participants.