Nothing. It's great. But it's the wrong tool for the job. Like teaching someone to stop a car by using the speedometer to estimate when to let go of the accelerator pedal, instead of introducing them to the brake pedal.
Please. There's nothing wrong with "hands-on first" approach. And the tortured metaphors completely kill your argument...
Checking limits is for preventing breaks. Visualizing heat is for troubleshooting when they happen anyway. You should do both.