I look at it this way: Most likely the code I write has a bug in it. Or, at the time of writing, the customer requirement is fuzzy. Or, I have a limited grasp

I look at it this way: Most likely the code I write has a bug in it. Or, at the time of writing, the customer requirement is fuzzy. Or, I have a limited grasp of the problem domain. Even if it is not any of the above, most likely there will be a change in a business requirement that impacts the code. So whenever possible, I opt to write code that is either stupidly obvious, trivially testable, or easily replaceable.