"Talent" as in reaction-time? Because that's the only real physical component to blocking balls behind the plate. It's like goaltending in hockey, you don't actually WAIT to see where the puck is ending up when it's shot, because obviously by the time you see exactly where it's going, it'd be too late to react to it. You see the puck off the stick and make a split-second decision on where you think it's going to be, then you "assume the position" and hope it hits you.
Same concept for blocking balls in the dirt, you have no idea which way it will bounce, but you can learn the best, statistically speaking, positions to assume for certain trajectories/spins, and this improves your success rate.