What is control in a tennis racquet? Why must power and control be compromised for each other in the selection of a racquet?

Billie Jean King said it best when she summarized the evolution of tennis from a previous era to the game we know today: When I grew up my coach said, 'Don't miss!' Today, when I'm coaching I say, 'Let it rip! We'll work on getting the ball in the court later.' Her career path followed the transition of tennis from old-school control tactics to modern-day power tactics, so it's fitting she could sum it up concisely. There are huge implications for tennis in each of those simp