Whether you're precise with your shot making or not, it's good advice to at least aim precisely. It's the best chance you've got to produce the shot you're hoping for...and to evaluate your results. 

Aiming vaguely or inconsistently is going to seriously limit your rate of improvement. 

Jack always used an intermediate target for every type of shot. He'd pick out something 6-10 feet in front of the ball to aim at...including on the putting green. 

Hope it's super helpful for you.