Sure there are other factors that are involved, but my point was, some coders are more deliberative while others are more exploratory. I'm in the latter group.

Sure there are other factors that are involved, but my point was, some coders are more deliberative while others are more exploratory. I'm in the latter group. I think by writing code. I do lots of refactoring and sometimes start over. Writing tests in the middle of that process would result in lots of thrown away test code and a much slower exploration of the problem space. Other coders think through problems first and know what they want before they start. They are more likely to benefit from something like TDD.