Like the the title says Wraithguard Targeting it has always been a problem that hasn't been fixed.
The main point is when Wraithguard are attacking a group or groups of enemies, sure when you attack one enemy like a Elite their great but when it's a group it all comes apart. Wraithguard always target the closest enemy to them so when dealing with a group all three shots go just to one unit in the group and doesn't affect the rest, wasting the other two specifically when the unit dies due to the first shot; and because of the Wraithguard's attack speed this is even more a problem.
What needs to change is that each Wraithguard in the group needs to target individually, so when dealing with three or more units in a group there will always be three units that always get hit instead of just one unit.
Also the Rift Blast doctrine should be changed to help deal with groups, even if the above does/doesn't get fixed.
Rift Blast should convert Armor-Piercing Damage into Normal Damage yes but also cause each shot to deal Splash Damage to nearby enemies, making Rift Blast an effective Anti-Infantry ability.