Spontaneity is also thinking. There are two distinct modes of thought. Verbal/abstract and real-time/intuition. These have neurological foundations in the two hemispheres. The right is more highly connected. The left has more to do with speech and rumination.

I was obviously referring to the thinking involved in making plans beforehand.

> thinking more is very useful for all the others.

Is it? Buddhist monks would likely disagree with you.

Buddhist monks usually live in monasteries. And the ones that don't live a very different life than most people.