So each school has a unique utility which helps them in the game.
Ice - Stuns Fire - Chokes (reduces accuracy) Death - Reduces opponents healing ability and damage Storm - Stuns and Removes Blades Myth - Removes blades and shields / Steals them Balance - Can blade themselves, friends, and has no shields against them
So what is Life's? I know we can heal, but so can every school. Yes we have Rebirth, but people do have access to Pigsie. Plus healing isn't really a 'utility' as such.
AoE heals are exclusively life school minus a few item only spells. Life is also unique in it's ability to remove DoTs. Shift is a thing yes but just as earthquake removing charms doesnt mean storms specialty isnt charm removal, the same principle applies to life.
Myth and Ice have no in-school heals at all. The closest they get is some of Myth's minions may cast Sprite now and then. Ice can steal a heal-over-time after they get to Avalon. They need a mastery amulet to heal themselves or anyone else.
Fire gets Link and Power Link, but these can only work on the wizard who casts the spell. They need a mastery amulet to heal themselves more than this, and especially if they want to heal anyone else.
Storm does get a heal spell ... at level 75 or so. That's a loonnngg wait. Until then, they need a mastery amulet to heal themselves (and given they have the lowest health of any school, that makes it rough going without any way to heal for so long in the game).
Death can heal themselves with Drain spells, or someone else by taking some of their own health and "Sacrificing" it to another player. In a high intensity dungeon, this can be a risky move.
Balance has heal-over-time spells that can help anyone. Their drawback is that it's hard to revive a dead player in an intense dungeon because these spells don't give a lot of health back all at once. The player might get killed again before the heal can take full effect.
Then there's Life. They can heal over time, give a large amount to one player all at once, heal a small or moderate amount to the whole team, etc. No other school can heal the whole team. Life's "utility spells" include various ways to enhance healing of the whole team, such as Guidance, Brilliant Light, Mass Triage and Sanctuary. They can even prevent a player from dying in the first place! (Guardian Spirit).
When you say "other schools have Pigsie," realize that 1) Pigsie is a LIFE school spell and 2) it's an extremely rare drop/painfully difficult to craft. In order to effectively use Pigsie, an non-Life school will need a mastery amulet...
Life Wizard's special ability is to give and support unlimited life to team mates byy the use of their spells. Other wizards can heal too but with one maybe 2 of their own spells including pigsie and that all they can do without using Treasure cards which is no comparison to Life wizards.
I don't see the big deal. You can mimic any school's gimmick with tc's. Pierce(Myth) is used everywhere as a tc. Steal Charm(Fire) is used at a lot of places. Cleanse(Storm) is used by a lot of schools to remove Bad Juju and Efreet's negative charm. Doom and Gloom(Death) is used by almost everyone in Darkmoor. And yes, people use Triage and Life healing tcs a lot too.
At the end of the day though, someone using spells of their school will always be better than when someone of another school tries to use those spells.
So each school has a unique utility which helps them in the game.
Ice - Stuns Fire - Chokes (reduces accuracy) Death - Reduces opponents healing ability and damage Storm - Stuns and Removes Blades Myth - Removes blades and shields / Steals them Balance - Can blade themselves, friends, and has no shields against them
So what is Life's? I know we can heal, but so can every school. Yes we have Rebirth, but people do have access to Pigsie. Plus healing isn't really a 'utility' as such.
AoE heals
High survivability
Highest accuracy
Second highest base health
Removing DoTs with Triage and Mass Triage
The ability to solo things quite well
Reviving themselves with Guardian Spirit
Boosting heals with Sanctuary, Guiding Light and Brilliant Light, which is basically equivalent to Balance's ability to buff others, but in this case, it's outgoing instead of damage
As someone has already said, basically being a friend request magnet
I don't see how healing isn't a special ability. Multiple schools can stun, multiple schools can "choke", multiple schools can remove blades. Life is just a lot better at healing.