Please answer a question about the following article about Seven Years%27 War:

In 1762, towards the end of the war, French forces attacked St. John's, Newfoundland. If successful, the expedition would have strengthened France's hand at the negotiating table. Although they took St. John's and raided nearby settlements, the French forces were eventually defeated by British troops at the Battle of Signal Hill. This was the final battle of the war in North America, and it forced the French to surrender to Lieutenant Colonel William Amherst. The victorious British now controlled all of eastern North America.

What advantage would taking St. John's have provided for the French?
the expedition would have strengthened France's hand at the negotiating table