Why did Federer stop using the drop shot in 2009/2010?
It was a shot that led him to Madrid, FO, Wimbledon victories back in 2009. He kept using it in mid/late 2009 but with less and less frequency. Why do you think he switched back to his old game afterwards?
Just shows you how pointless H2H's are. Nadal beat Fed but in the end it meant jack, they both walked away with nothing. It's about winning titles.