I see healers use all ones you mention rather regularly. Some of the abilities you mentioned are niche as well or sometimes just are not needed due to how steam roll a lot of the content is currently. It also could just be that you have been getting a lot of lazy or bad healers. Not sure why this is a surprise since I regularly run into the same kind of people playing tank/dps. Just the other week in pagos the tank on louhi had a ultimate curtana and ate every ae. Obvious that he was good enough to get the weapon but was just to lazy to do the content.