Shipping faster is really just another form of cheaper. It isn't a linear relationship (the whole 9 women working for 1 month thing), but there is no question that dedicating more resources to a problem can help fix it quicker, especially with the frequency that companies are acquired in tech.

I am not sure that Facebook creating Instagram Stories to compete with Snapchat is a definitively better solution than Twitter buying Periscope to compete with Meerkat. Either way, you still need someone to think up those new features, communicate them to the public, and sell them to your customers.