It doesn't seem to have a purpose at all. At 80 with basic ronkan gear its healing for 900 and crits for maybe 1300(An impressive 1.1% of HP)? My health potion heals for more and requires no cast time.
I get it, we have the spell because of the tumor known as scholar. But i don't understand why it wasn't pruned with everything else, it serves no purpose now, as we can't even heal the mobile dot anymore. Comparing it to our contemporaries the Dancer and Red Mage just make the problem evident as both of them have effective and situationaly useful heals. I do not expect to have as good as heals as redmage, as even my lv60 RDM heals for 3500-4000 single heals not counting the dual cast. But i would expect it to be on par with dancer given it has a 2.5s cast time and costs mana.
Could i recommend fixing this instead of removing it? If it cannot be modified because of scholar, perhaps just give us a new one with some summoner flare. Let us summon Eos temporarily to heal us. Fairy/Sylph has been a recurring healing summon for a few games now. Give it the same 1minute cooldown as dancer, keep the cast time, and make it heal for atleast 30% of our life, and maybe make it an aoe. Ground targeted if you really want us to feel bad for using it.
This spell has simple been terrible since its inception but has only gotten worse. The fact it wasn't removed is mind boggling frankly.