Here is the same photo with only the fill light increased to 1.0, All other settings same.
Now the children (mine!) are not washed out, yet the backround is still well exposed.
Most corrections for fill don't require this much fill. It's very dramatic to see what can be done to a single photo. Now i Never get rid of nice, but underexposed, photos!
Yes, it is a miracle tool. You cannot believe how many photos are saved by this feature alone.

ps-They found some nice clay down in the river.
Who needs a grey card!?!?