Even with that change, I feel like with the latest changes it has changed it so Nivaria's hand is the better spell to use in explorer mode, while Nivaria's word is the better spell to use in the heat of combat.
Because if you have SP 3 (which wouldn't be that abnormal for a spellcaster) you would get the following in explorer mode:
Nivaria's hand:
2d6 + 3 (average 10) for 4WP, so an average of 20 for 8WP
With as added benefit that if you have a high roll then you can use your second casting on another member.
Nivaria's word:
6 + 3d6 + 3 (average 19,5) for 8WP
So this means that at Nivaria's hand gets a better average healing from 3SP, and it gets even better with higher SP.
On top of that, Nivaria's hand triggers Hand of Mercy twice, giving you a free 1d4 every time.
So the actual average for a 3SP character with Hand of Mercy would be:
Nivaria's hand:
2d6 + 3 + 1d4 (average 12,5) for 4WP, so an average of 25 for 8WP
Nivaria's word:
6 + 3d6 + 3 + 1d4 (average 22) for 8WP
This doesn't mean that Nivaria's word doesn't have its place anymore. During combat it is still able to give the highest burst of healing in a single action and it is ranged.
But now after the change, for exploration mode, Nivaria's hand is better because it provides the best heal per WP ratio.