The defense aura tree sucks. 1 pt in salvation is the only good aura in the entire tree and it is situational at best.
This is just not a team game. Having a variety of situational defensie auras just isn’t useful to the average paladin as having a stacked offensive aura.
It be more fun if paladins could have a choice. Weaker auras but able to chose a line up of 2 to 3. Or they could specialize in one at the cost of versatility. This way the defensive auras could see play time alongside the bread and butter offensive auras. Even if you need to nerf paladin stats to balance having multiple aura it still be more fun to mix and match aura.