I'm trying to figure out what weird situation caused them to nerf it. As far as I'm aware, no mechanic was being trivialized because Scholoton lasted too long. Maybe someone in one of the devs' raid teams ran into a wall because they forgot they had sprint speed and nerfed it because any inconvenience healers cause DPS, no matter how small, must be immediately removed?

It'd explain why the speed duration went down and not, oh, I don't know, Macrocosmos deleting an entire heal check mechanic.