A good manager recognizes that a good 10x developer needs minimal management. Not that they don't need managing, but that too much management throws a wrench in the mental gears and drags them down, burns them out, and forces them to quit. All they need is a light hand on the steering wheel to keep them pointed at the right problems.

But sibling comment is also right. The 10x developer has more "free" time outside of their Jira tickets. Some choose to focus on the next business problem, others drift and experiment.

Either way the business problem gets solved and you retain a very skilled employee. Their explorations may turn up something valuable, or just add to their own personal dragon hoard of skills, when then usually still benefits you in the end