You're misunderstanding "thinking before you code" vs premature blahblah. It shares the same mindset as the saying: Fail to prepare is prepare to fail ! The c

You're misunderstanding "thinking before you code" vs premature blahblah. It shares the same mindset as the saying: Fail to prepare is prepare to fail ! The challenges and the evils is in the details of the process of optimization, not that premature optimization is evil.