And by handing over all the small decisions and things like writing unit tests, you are opting in to mediocre code quality (or worse) and you no longer get the full experience of using your code, for example when writing unit tests yourself. Or when in other cases where you call your own procedures from your own code. When writing a test becomes difficult it is often (not always) an indication of bad code quality. It will also lead to you being less familiar with the code in general.

It may be, that all of those are OK in your scenario or use case.