Grasp of the Undying is actually so stupid

Everyone complained about aftershock but....

How does a tank keystone regularly out damage actual damage keystones like Aery, Comet, and Electrocute on a regular basis? Not only does Grasp out damage these keystones when used on the right champion, it heals for a LOT, and increases maximum HP. There is actually no reason for grasp to be so overbuffed compared to last season.