Steve Jobs wrote code early on, but he was never a great programmer. That didn’t diminish his impact at all. Same with plenty of people we label as "masters" in hindsight. The mastery isn’t always in the craft itself.
What actually seems risky is anchoring your identity to being the best at a specific thing in a specific era. If you're the town’s horse whisperer, life is great right up until cars show up. Then what? If your value is "I'm the horse guy," you're toast. If your value is taste, judgment, curiosity, or building good things with other people, you adapt.
So I’m not convinced mastery is about skill depth alone. It's about what survives the tool shift.