> No. I achieved this because the code contained very little of the real value. That was all stored in my head. The design was in my head, and with hindsight I could see all its flaws. I was therefore able to create a much more efficient and effective design based on that learning.

Exactly. Code is cheap to write. Even a lot of it. What's hard is understanding a problem thoroughly enough to model a correct solution. Once you have that, you've done 90% of the work.