Please add some healer incentives
There are never any healers in pvp, if you go into feast it's usually all dps and tanks unless someone reluctantly changes to healer. If no one does, then the match might as well already be over because your team is going to get steamrolled, I've even been in groups where people just abandon the match because no one changed to healer. With no healers, pvp matches just aren't fun, but I can't blame people for not wanting to heal because there's no benefit to it.
It also doesn't help that healing became a lot harder since stormblood which makes people want to heal even less, I have friends who levelled all their jobs in pvp except their healers because they'd "rather level up solely from aurum vale than heal frontlines as it is right now".
Dps and tanks get incentives, they can get kills and assists for a minion in feast and things like battle high and battle fever in frontlines. (yes healers can get these too but why do it as a healer when you can get far more as a tank or dps?)
So please SE, add some healer incentives to pvp. Add achievements to feast and frontlines that give titles and minions for hp restored. Add healer high where healing a certain amount without dying makes your heals faster and stronger and healer fever where healing a certain amount without anyone in your party dying makes all your heals AoE. (Shouldn't count overhealing).
People just need something that will make them want to go healer over dps or tank, right now healing is charity work, there's no reason to do it except to help your team.