An interesting question might be: I decide I want to be an expert racing driver and I know in order to achieve that I need 10,000 hours of deliberate practice.

An interesting question might be: I decide I want to be an expert racing driver and I know in order to achieve that I need 10,000 hours of deliberate practice. So I look at the controls and I see that I have a clutch, an accelerator, a brake pedal and a steering wheel - I decide to spend 2500 hours of deliberate practice on each. After 10,000 hours I am an expert in accelerating as hard as possible without spinning the wheels (accelerator), heel and toe gear changes (clutch), braking as hard as possible without locking the wheels (brake) and following the optimum racing line (steering). The next day they introduce semi-automatic gearboxes, anti-lock brakes and traction control. Some of my 10,000 hours were spent on obsolete skills. Am I still an expert?