They have some, but not that many. Turning people young again, is a separate albeit related healing skill. There are some limitations that might or might not depend on the healer level of skill. Like needing the body or at least the brain. Healing brain damage is a required sub-skill for proper resurrection, but it still is tricky to bring someone back properly. And trickier the more damaged it is.
There is also a gift of resurrection, which Phoenixes and Sea serpents may have. Dragons too, because one of their gifts might be the ability to choose a gift and that's a popular one. Unlike the healing variation, this one requires to touch the person while they die. Using it on a lifeless body won't work. If it works the body turns to ash and the person enters a "queue" that resurrects a person every eight days. With a limit of eight people stored. If someone with resurrection and full queue dies, then they will have to let go of one the dead or everyone will be lost. And because the bodies turn to ash, very few healers will be able to bring them back from that state.
On a social level, it means that the most powerful people will invest on having healers or resurrectors around on call. Which also means paying for these healers and their families to be fed and protected. Vio's society is also of opinion that the more one makes one's life an obstacle to other people's ambitions the more in danger they are. Meaning, that would-be eternal kings tend to be shorter lived than kings that eventually step down.