This may be usually true, but that's all.

"I think skillful grief can bring us more into touch with our faculty of seeing the world plainly as we already know it to be."

Perhaps. But I think grieving need not do so, grieving can be destructive. I also think "skilled grieving" can often mean let it go, move on. I think "skilled grieving" is another aspect of thinking clearly. It seems we agree, so far.

But then "skilled grieving" is a positive aspect of grieving. I think it possible to argue that avoiding grief is another way of saying "skillful grieving". Embracing grief, wallowing in grief, those are to be AVOIDED, skillfully.

If grief simply means realising the painful truth of something and getting over it then, of course, we're all in favour of that. But that isn't all what grief encompasses, it's more than that. It's often unavoidable, emotional not rational. The term "skilled grieving" seems to ignore that aspect.