Good insight, and indeed quite exactly my state of mind while creating this particular solution.

Iin this case, I did put in the guard rails to ensure that I reach my goal in hopefully a straight line and a quickly as possible, but to be honest, I did not give much thought to long-term maintainability or ease of extending it with more and more features, because I needed a very specific solution for a use case that doesn't change much.

I'm definitely working differently in my brown-field projects where I'm intimately familiar with the tech stack and architecture — I do very thorough code reviews afterwards.