They have a 25% Haste buff they can grant to others, Rescue (but less buggy and more responsive and on a far shorter cooldown), a 4 second ranged stun, a party wide Esuna, a Sleep, a Death Prevention buff they can grant to others, and second status-effect cleansing type.
"Don't have utility"
...
Both Prayer of Healing (AoE) and Flash Heal (ST) usage should be minimized.
And Holy has atop this, rotationally...
- proc-producing DoTs,
- a healing-damaging boomerang skillshot or a massive propagating radial AoE they'd need to position for,
- an offensive nuke with either a sleep or stun depending on talents (and the CD of which they can reduce through their offensive filler spell for alignment/rush, giving more gamble to one's GCDs spent healing or attacking),
- synergy with their HoT and rotationally grantable buff, ramping and spendable buffs granted by their heals for preemptive burst healing, and
- (in typical builds) Lily-esque procs from their filler damage spell.
And all that's prior to any "borrowed powers" or gear effects or the general macrorotational priority changes of your filler AoE and filler ST heals each charging a respective AoE or ST nuke heal.