Deliberate practice require more than doing your job

Deliberate practise and doing the real thing address different problems.

• Deliberate practise: World-class performers get good by focused, and intensive practise sessions with the intention to improve, not by just doing the skill.
• Doing the real thing: However, for someone trying to advance in a big organisation, it isn't about getting better at a skill they have been doing for twenty years, but developing new skills. The programmer becomes a manager.