Client get's injured, I have to take out deadlifts and replace them with something else. Instead of going through all of the workouts in the program and switching this manually, this option would find all of the deadlifts in the program and replace them with a chosen exercise.

Also great for equipment variations. Ex. I have a master program built out with barbell squat. They don't have a barbell available. I can just go in and replace all the barbell squats with dumbbell squat.

This would save SO MUCH FREAKING TIME with workout customization.