If your code is sufficiently encapsulated in a way that it's easily deletable and therefore easily replaceable it's perfectly fine to mark it as "fix later". N

If your code is sufficiently encapsulated in a way that it's easily deletable and therefore easily replaceable it's perfectly fine to mark it as "fix later". Now, the two examples in the article, not doing data validation server side and starting with Mongodb are not "fix me later" anyway, they're professional mistakes.