Pre-Crisis Wonder Woman DID have some awesome feats to her credit, even, perhaps especially, in her Golden Age.
Strangely, the reasoning for her ability to perform these was fairly egalitarian: she trained hard.
Inasmuch as the famous King Syndicate figure Popeye encouraged youth to eat their vegetables, Moulton used Diana to try and inspire young women to discipline themselves to be their best, as the next series of images should show:
One misconception many people have is that Diana, as Wonder Woman, was the strongest of the Amazons. Perhaps strongest AND most skillful.
Actually, she wasn't, and this conclusion derives naturally from the concept of her original power source, which, again, was training.
Diana trained harder and longer than almost anyone, she should have the results of one who trained harder and longer.
And Diana did, for the most part.
Except there was one person who disciplined herself to an even greater extent. To deserve the privelege of rulership entrusted to her.
Good thing for Diana - Mom really DID know this stuff best...!