It's true, but it's not relevant. Take for instance mental arithmetic. Once you have the skill down, there's no real thinking involved anymore. Same with chess. Chess masters generally don't really think deep or hard. They just see and recognize more patterns. No thinking involved.

The trick is to get it (whatever "it" is) "down" to that level. Thinking fast and slow is a book about this topic.

https://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow